lnet/klnds/o2iblnd/o2iblnd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  *
  31  * lnet/klnds/o2iblnd/o2iblnd.c
  32  *
  33  * Author: Eric Barton <eric@bartonsoftware.com>
  34  */
  35
  36 #include <asm/page.h>
  37 #include <linux/ethtool.h>
  38 #include <linux/inetdevice.h>
  39
  40 #include "o2iblnd.h"
  41
  42 static const struct lnet_lnd the_o2iblnd;
  43
  44 struct kib_data kiblnd_data;
  45
  46 static __u32
  47 kiblnd_cksum (void *ptr, int nob)
  48 {
  49         char  *c  = ptr;
  50         __u32  sum = 0;
  51
  52         while (nob-- > 0)
  53                 sum = ((sum << 1) | (sum >> 31)) + *c++;
  54
  55         /* ensure I don't return 0 (== no checksum) */
  56         return (sum == 0) ? 1 : sum;
  57 }
  58
  59 static char *
  60 kiblnd_msgtype2str(int type)
  61 {
  62         switch (type) {
  63         case IBLND_MSG_CONNREQ:
  64                 return "CONNREQ";
  65
  66         case IBLND_MSG_CONNACK:
  67                 return "CONNACK";
  68
  69         case IBLND_MSG_NOOP:
  70                 return "NOOP";
  71
  72         case IBLND_MSG_IMMEDIATE:
  73                 return "IMMEDIATE";
  74
  75         case IBLND_MSG_PUT_REQ:
  76                 return "PUT_REQ";
  77
  78         case IBLND_MSG_PUT_NAK:
  79                 return "PUT_NAK";
  80
  81         case IBLND_MSG_PUT_ACK:
  82                 return "PUT_ACK";
  83
  84         case IBLND_MSG_PUT_DONE:
  85                 return "PUT_DONE";
  86
  87         case IBLND_MSG_GET_REQ:
  88                 return "GET_REQ";
  89
  90         case IBLND_MSG_GET_DONE:
  91                 return "GET_DONE";
  92
  93         default:
  94                 return "???";
  95         }
  96 }
  97
  98 static int
  99 kiblnd_msgtype2size(int type)
 100 {
 101         const int hdr_size = offsetof(struct kib_msg, ibm_u);
 102
 103         switch (type) {
 104         case IBLND_MSG_CONNREQ:
 105         case IBLND_MSG_CONNACK:
 106                 return hdr_size + sizeof(struct kib_connparams);
 107
 108         case IBLND_MSG_NOOP:
 109                 return hdr_size;
 110
 111         case IBLND_MSG_IMMEDIATE:
 112                 return offsetof(struct kib_msg, ibm_u.immediate.ibim_payload[0]);
 113
 114         case IBLND_MSG_PUT_REQ:
 115                 return hdr_size + sizeof(struct kib_putreq_msg);
 116
 117         case IBLND_MSG_PUT_ACK:
 118                 return hdr_size + sizeof(struct kib_putack_msg);
 119
 120         case IBLND_MSG_GET_REQ:
 121                 return hdr_size + sizeof(struct kib_get_msg);
 122
 123         case IBLND_MSG_PUT_NAK:
 124         case IBLND_MSG_PUT_DONE:
 125         case IBLND_MSG_GET_DONE:
 126                 return hdr_size + sizeof(struct kib_completion_msg);
 127         default:
 128                 return -1;
 129         }
 130 }
 131
 132 static int kiblnd_unpack_rd(struct kib_msg *msg, bool flip)
 133 {
 134         struct kib_rdma_desc *rd;
 135         int nob;
 136         int n;
 137         int i;
 138
 139         LASSERT(msg->ibm_type == IBLND_MSG_GET_REQ ||
 140                 msg->ibm_type == IBLND_MSG_PUT_ACK);
 141
 142         rd = msg->ibm_type == IBLND_MSG_GET_REQ ?
 143                 &msg->ibm_u.get.ibgm_rd :
 144                 &msg->ibm_u.putack.ibpam_rd;
 145
 146         if (flip) {
 147                 __swab32s(&rd->rd_key);
 148                 __swab32s(&rd->rd_nfrags);
 149         }
 150
 151         n = rd->rd_nfrags;
 152
 153         if (n <= 0 || n > IBLND_MAX_RDMA_FRAGS) {
 154                 CERROR("Bad nfrags: %d, should be 0 < n <= %d\n",
 155                        n, IBLND_MAX_RDMA_FRAGS);
 156                 return 1;
 157         }
 158
 159         nob = offsetof(struct kib_msg, ibm_u) +
 160                 kiblnd_rd_msg_size(rd, msg->ibm_type, n);
 161
 162         if (msg->ibm_nob < nob) {
 163                 CERROR("Short %s: %d(%d)\n",
 164                        kiblnd_msgtype2str(msg->ibm_type), msg->ibm_nob, nob);
 165                 return 1;
 166         }
 167
 168         if (!flip)
 169                 return 0;
 170
 171         for (i = 0; i < n; i++) {
 172                 __swab32s(&rd->rd_frags[i].rf_nob);
 173                 __swab64s(&rd->rd_frags[i].rf_addr);
 174         }
 175
 176         return 0;
 177 }
 178
 179 void kiblnd_pack_msg(struct lnet_ni *ni, struct kib_msg *msg, int version,
 180                      int credits, lnet_nid_t dstnid, __u64 dststamp)
 181 {
 182         struct kib_net *net = ni->ni_data;
 183
 184         /* CAVEAT EMPTOR! all message fields not set here should have been
 185          * initialised previously.
 186          */
 187         msg->ibm_magic    = IBLND_MSG_MAGIC;
 188         msg->ibm_version  = version;
 189         /*   ibm_type */
 190         msg->ibm_credits  = credits;
 191         /*   ibm_nob */
 192         msg->ibm_cksum    = 0;
 193         msg->ibm_srcnid   = lnet_nid_to_nid4(&ni->ni_nid);
 194         msg->ibm_srcstamp = net->ibn_incarnation;
 195         msg->ibm_dstnid   = dstnid;
 196         msg->ibm_dststamp = dststamp;
 197
 198         if (*kiblnd_tunables.kib_cksum) {
 199                 /* NB ibm_cksum zero while computing cksum */
 200                 msg->ibm_cksum = kiblnd_cksum(msg, msg->ibm_nob);
 201         }
 202 }
 203
 204 int kiblnd_unpack_msg(struct kib_msg *msg, int nob)
 205 {
 206         const int hdr_size = offsetof(struct kib_msg, ibm_u);
 207         __u32 msg_cksum;
 208         __u16 version;
 209         int msg_nob;
 210         bool flip;
 211
 212         /* 6 bytes are enough to have received magic + version */
 213         if (nob < 6) {
 214                 CERROR("Short message: %d\n", nob);
 215                 return -EPROTO;
 216         }
 217
 218         if (msg->ibm_magic == IBLND_MSG_MAGIC) {
 219                 flip = false;
 220         } else if (msg->ibm_magic == __swab32(IBLND_MSG_MAGIC)) {
 221                 flip = true;
 222         } else {
 223                 CERROR("Bad magic: %08x\n", msg->ibm_magic);
 224                 return -EPROTO;
 225         }
 226
 227         version = flip ? __swab16(msg->ibm_version) : msg->ibm_version;
 228         if (version != IBLND_MSG_VERSION &&
 229             version != IBLND_MSG_VERSION_1) {
 230                 CERROR("Bad version: %x\n", version);
 231                 return -EPROTO;
 232         }
 233
 234         if (nob < hdr_size) {
 235                 CERROR("Short message: %d\n", nob);
 236                 return -EPROTO;
 237         }
 238
 239         msg_nob = flip ? __swab32(msg->ibm_nob) : msg->ibm_nob;
 240         if (msg_nob > nob) {
 241                 CERROR("Short message: got %d, wanted %d\n", nob, msg_nob);
 242                 return -EPROTO;
 243         }
 244
 245         /* checksum must be computed with ibm_cksum zero and BEFORE anything
 246          * gets flipped
 247          */
 248         msg_cksum = flip ? __swab32(msg->ibm_cksum) : msg->ibm_cksum;
 249         msg->ibm_cksum = 0;
 250         if (msg_cksum != 0 &&
 251             msg_cksum != kiblnd_cksum(msg, msg_nob)) {
 252                 CERROR("Bad checksum\n");
 253                 return -EPROTO;
 254         }
 255
 256         msg->ibm_cksum = msg_cksum;
 257
 258         if (flip) {
 259                 /* leave magic unflipped as a clue to peer_ni endianness */
 260                 msg->ibm_version = version;
 261                 BUILD_BUG_ON(sizeof(msg->ibm_type) != 1);
 262                 BUILD_BUG_ON(sizeof(msg->ibm_credits) != 1);
 263                 msg->ibm_nob     = msg_nob;
 264                 __swab64s(&msg->ibm_srcnid);
 265                 __swab64s(&msg->ibm_srcstamp);
 266                 __swab64s(&msg->ibm_dstnid);
 267                 __swab64s(&msg->ibm_dststamp);
 268         }
 269
 270         if (msg->ibm_srcnid == LNET_NID_ANY) {
 271                 CERROR("Bad src nid: %s\n", libcfs_nid2str(msg->ibm_srcnid));
 272                 return -EPROTO;
 273         }
 274
 275         if (msg_nob < kiblnd_msgtype2size(msg->ibm_type)) {
 276                 CERROR("Short %s: %d(%d)\n", kiblnd_msgtype2str(msg->ibm_type),
 277                        msg_nob, kiblnd_msgtype2size(msg->ibm_type));
 278                 return -EPROTO;
 279         }
 280
 281         switch (msg->ibm_type) {
 282         default:
 283                 CERROR("Unknown message type %x\n", msg->ibm_type);
 284                 return -EPROTO;
 285
 286         case IBLND_MSG_NOOP:
 287         case IBLND_MSG_IMMEDIATE:
 288         case IBLND_MSG_PUT_REQ:
 289                 break;
 290
 291         case IBLND_MSG_PUT_ACK:
 292         case IBLND_MSG_GET_REQ:
 293                 if (kiblnd_unpack_rd(msg, flip))
 294                         return -EPROTO;
 295                 break;
 296
 297         case IBLND_MSG_PUT_NAK:
 298         case IBLND_MSG_PUT_DONE:
 299         case IBLND_MSG_GET_DONE:
 300                 if (flip)
 301                         __swab32s(&msg->ibm_u.completion.ibcm_status);
 302                 break;
 303
 304         case IBLND_MSG_CONNREQ:
 305         case IBLND_MSG_CONNACK:
 306                 if (flip) {
 307                         __swab16s(&msg->ibm_u.connparams.ibcp_queue_depth);
 308                         __swab16s(&msg->ibm_u.connparams.ibcp_max_frags);
 309                         __swab32s(&msg->ibm_u.connparams.ibcp_max_msg_size);
 310                 }
 311                 break;
 312         }
 313         return 0;
 314 }
 315
 316 int
 317 kiblnd_create_peer(struct lnet_ni *ni, struct kib_peer_ni **peerp,
 318                    lnet_nid_t nid)
 319 {
 320         struct kib_peer_ni *peer_ni;
 321         struct kib_net *net = ni->ni_data;
 322         int cpt = lnet_cpt_of_nid(nid, ni);
 323         unsigned long flags;
 324
 325         LASSERT(net != NULL);
 326         LASSERT(nid != LNET_NID_ANY);
 327
 328         LIBCFS_CPT_ALLOC(peer_ni, lnet_cpt_table(), cpt, sizeof(*peer_ni));
 329         if (!peer_ni) {
 330                 CERROR("Cannot allocate peer_ni\n");
 331                 return -ENOMEM;
 332         }
 333
 334         peer_ni->ibp_ni = ni;
 335         peer_ni->ibp_nid = nid;
 336         peer_ni->ibp_error = 0;
 337         peer_ni->ibp_last_alive = 0;
 338         peer_ni->ibp_max_frags = IBLND_MAX_RDMA_FRAGS;
 339         peer_ni->ibp_queue_depth = ni->ni_net->net_tunables.lct_peer_tx_credits;
 340         peer_ni->ibp_queue_depth_mod = 0;       /* try to use the default */
 341         kref_init(&peer_ni->ibp_kref);
 342         atomic_set(&peer_ni->ibp_nconns, 0);
 343
 344         INIT_HLIST_NODE(&peer_ni->ibp_list);
 345         INIT_LIST_HEAD(&peer_ni->ibp_conns);
 346         INIT_LIST_HEAD(&peer_ni->ibp_tx_queue);
 347
 348         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 349
 350         /* always called with a ref on ni, which prevents ni being shutdown */
 351         LASSERT(net->ibn_shutdown == 0);
 352
 353         /* npeers only grows with the global lock held */
 354         atomic_inc(&net->ibn_npeers);
 355
 356         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 357
 358         *peerp = peer_ni;
 359         return 0;
 360 }
 361
 362 void
 363 kiblnd_destroy_peer(struct kref *kref)
 364 {
 365         struct kib_peer_ni *peer_ni = container_of(kref, struct kib_peer_ni,
 366                                                    ibp_kref);
 367         struct kib_net *net = peer_ni->ibp_ni->ni_data;
 368
 369         LASSERT(net != NULL);
 370         LASSERT(!kiblnd_peer_active(peer_ni));
 371         LASSERT(kiblnd_peer_idle(peer_ni));
 372         LASSERT(list_empty(&peer_ni->ibp_tx_queue));
 373
 374         LIBCFS_FREE(peer_ni, sizeof(*peer_ni));
 375
 376         /* NB a peer_ni's connections keep a reference on their peer_ni until
 377          * they are destroyed, so we can be assured that _all_ state to do
 378          * with this peer_ni has been cleaned up when its refcount drops to
 379          * zero.
 380          */
 381         if (atomic_dec_and_test(&net->ibn_npeers))
 382                 wake_up_var(&net->ibn_npeers);
 383 }
 384
 385 struct kib_peer_ni *
 386 kiblnd_find_peer_locked(struct lnet_ni *ni, lnet_nid_t nid)
 387 {
 388         /* the caller is responsible for accounting the additional reference
 389          * that this creates
 390          */
 391         struct kib_peer_ni *peer_ni;
 392
 393         hash_for_each_possible(kiblnd_data.kib_peers, peer_ni,
 394                                ibp_list, nid) {
 395                 LASSERT(!kiblnd_peer_idle(peer_ni));
 396
 397                 /*
 398                  * Match a peer if its NID and the NID of the local NI it
 399                  * communicates over are the same. Otherwise don't match
 400                  * the peer, which will result in a new lnd peer being
 401                  * created.
 402                  */
 403                 if (peer_ni->ibp_nid != nid ||
 404                     !nid_same(&peer_ni->ibp_ni->ni_nid, &ni->ni_nid))
 405                         continue;
 406
 407                 CDEBUG(D_NET, "got peer_ni [%p] -> %s (%d) version: %x\n",
 408                        peer_ni, libcfs_nid2str(nid),
 409                        kref_read(&peer_ni->ibp_kref),
 410                        peer_ni->ibp_version);
 411                 return peer_ni;
 412         }
 413         return NULL;
 414 }
 415
 416 void
 417 kiblnd_unlink_peer_locked(struct kib_peer_ni *peer_ni)
 418 {
 419         LASSERT(list_empty(&peer_ni->ibp_conns));
 420
 421         LASSERT(kiblnd_peer_active(peer_ni));
 422         hlist_del_init(&peer_ni->ibp_list);
 423         /* lose peerlist's ref */
 424         kiblnd_peer_decref(peer_ni);
 425 }
 426
 427
 428 static void
 429 kiblnd_debug_rx(struct kib_rx *rx)
 430 {
 431         CDEBUG(D_CONSOLE, "      %p msg_type %x cred %d\n",
 432                rx, rx->rx_msg->ibm_type,
 433                rx->rx_msg->ibm_credits);
 434 }
 435
 436 static void
 437 kiblnd_debug_tx(struct kib_tx *tx)
 438 {
 439         CDEBUG(D_CONSOLE, "      %p snd %d q %d w %d rc %d dl %lld "
 440                "cookie %#llx msg %s%s type %x cred %d\n",
 441                tx, tx->tx_sending, tx->tx_queued, tx->tx_waiting,
 442                tx->tx_status, ktime_to_ns(tx->tx_deadline), tx->tx_cookie,
 443                tx->tx_lntmsg[0] == NULL ? "-" : "!",
 444                tx->tx_lntmsg[1] == NULL ? "-" : "!",
 445                tx->tx_msg->ibm_type, tx->tx_msg->ibm_credits);
 446 }
 447
 448 static void
 449 kiblnd_debug_conn(struct kib_conn *conn)
 450 {
 451         struct list_head        *tmp;
 452         int                     i;
 453
 454         spin_lock(&conn->ibc_lock);
 455
 456         CDEBUG(D_CONSOLE, "conn[%d] %p [version %x] -> %s:\n",
 457                atomic_read(&conn->ibc_refcount), conn,
 458                conn->ibc_version, libcfs_nid2str(conn->ibc_peer->ibp_nid));
 459         CDEBUG(D_CONSOLE, "   state %d nposted %d/%d cred %d o_cred %d "
 460                " r_cred %d\n", conn->ibc_state, conn->ibc_noops_posted,
 461                conn->ibc_nsends_posted, conn->ibc_credits,
 462                conn->ibc_outstanding_credits, conn->ibc_reserved_credits);
 463         CDEBUG(D_CONSOLE, "   comms_err %d\n", conn->ibc_comms_error);
 464
 465         CDEBUG(D_CONSOLE, "   early_rxs:\n");
 466         list_for_each(tmp, &conn->ibc_early_rxs)
 467                 kiblnd_debug_rx(list_entry(tmp, struct kib_rx, rx_list));
 468
 469         CDEBUG(D_CONSOLE, "   tx_noops:\n");
 470         list_for_each(tmp, &conn->ibc_tx_noops)
 471                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 472
 473         CDEBUG(D_CONSOLE, "   tx_queue_nocred:\n");
 474         list_for_each(tmp, &conn->ibc_tx_queue_nocred)
 475                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 476
 477         CDEBUG(D_CONSOLE, "   tx_queue_rsrvd:\n");
 478         list_for_each(tmp, &conn->ibc_tx_queue_rsrvd)
 479                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 480
 481         CDEBUG(D_CONSOLE, "   tx_queue:\n");
 482         list_for_each(tmp, &conn->ibc_tx_queue)
 483                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 484
 485         CDEBUG(D_CONSOLE, "   active_txs:\n");
 486         list_for_each(tmp, &conn->ibc_active_txs)
 487                 kiblnd_debug_tx(list_entry(tmp, struct kib_tx, tx_list));
 488
 489         CDEBUG(D_CONSOLE, "   rxs:\n");
 490         for (i = 0; i < IBLND_RX_MSGS(conn); i++)
 491                 kiblnd_debug_rx(&conn->ibc_rxs[i]);
 492
 493         spin_unlock(&conn->ibc_lock);
 494 }
 495
 496 static void
 497 kiblnd_dump_peer_debug_info(struct kib_peer_ni *peer_ni)
 498 {
 499         struct kib_conn *conn;
 500         struct kib_conn *cnxt;
 501         int count = 0;
 502
 503         CDEBUG(D_CONSOLE, "[last_alive, races, reconnected, error]: %lld, %d, %d, %d\n",
 504                peer_ni->ibp_last_alive,
 505                peer_ni->ibp_races,
 506                peer_ni->ibp_reconnected,
 507                peer_ni->ibp_error);
 508         list_for_each_entry_safe(conn, cnxt, &peer_ni->ibp_conns,
 509                                  ibc_list) {
 510                 CDEBUG(D_CONSOLE, "Conn %d:\n", count);
 511                 kiblnd_debug_conn(conn);
 512                 count++;
 513         }
 514 }
 515
 516
 517 static int
 518 kiblnd_get_peer_info(struct lnet_ni *ni, lnet_nid_t nid, int index,
 519                      lnet_nid_t *nidp, int *count)
 520 {
 521         struct kib_peer_ni              *peer_ni;
 522         int                      i;
 523         unsigned long            flags;
 524
 525         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 526
 527         hash_for_each(kiblnd_data.kib_peers, i, peer_ni, ibp_list) {
 528                 LASSERT(!kiblnd_peer_idle(peer_ni));
 529
 530                 if (peer_ni->ibp_ni != ni)
 531                         continue;
 532
 533                 if (peer_ni->ibp_nid == nid)
 534                         kiblnd_dump_peer_debug_info(peer_ni);
 535
 536                 if (index-- > 0)
 537                         continue;
 538
 539                 *nidp = peer_ni->ibp_nid;
 540                 *count = kref_read(&peer_ni->ibp_kref);
 541
 542                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 543                 return 0;
 544         }
 545
 546         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 547         return -ENOENT;
 548 }
 549
 550 static void
 551 kiblnd_del_peer_locked(struct kib_peer_ni *peer_ni)
 552 {
 553         struct kib_conn *cnxt;
 554         struct kib_conn *conn;
 555
 556         if (list_empty(&peer_ni->ibp_conns)) {
 557                 kiblnd_unlink_peer_locked(peer_ni);
 558         } else {
 559                 list_for_each_entry_safe(conn, cnxt, &peer_ni->ibp_conns,
 560                                          ibc_list)
 561                         kiblnd_close_conn_locked(conn, 0);
 562                 /* NB closing peer_ni's last conn unlinked it. */
 563         }
 564         /* NB peer_ni now unlinked; might even be freed if the peer_ni table had the
 565          * last ref on it. */
 566 }
 567
 568 static int
 569 kiblnd_del_peer(struct lnet_ni *ni, lnet_nid_t nid)
 570 {
 571         LIST_HEAD(zombies);
 572         struct hlist_node *pnxt;
 573         struct kib_peer_ni *peer_ni;
 574         int lo;
 575         int hi;
 576         int i;
 577         unsigned long flags;
 578         int rc = -ENOENT;
 579
 580         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 581
 582         if (nid != LNET_NID_ANY) {
 583                 lo = hash_min(nid, HASH_BITS(kiblnd_data.kib_peers));
 584                 hi = lo;
 585         } else {
 586                 lo = 0;
 587                 hi = HASH_SIZE(kiblnd_data.kib_peers) - 1;
 588         }
 589
 590         for (i = lo; i <= hi; i++) {
 591                 hlist_for_each_entry_safe(peer_ni, pnxt,
 592                                           &kiblnd_data.kib_peers[i], ibp_list) {
 593                         LASSERT(!kiblnd_peer_idle(peer_ni));
 594
 595                         if (peer_ni->ibp_ni != ni)
 596                                 continue;
 597
 598                         if (!(nid == LNET_NID_ANY || peer_ni->ibp_nid == nid))
 599                                 continue;
 600
 601                         if (!list_empty(&peer_ni->ibp_tx_queue)) {
 602                                 LASSERT(list_empty(&peer_ni->ibp_conns));
 603
 604                                 list_splice_init(&peer_ni->ibp_tx_queue,
 605                                                  &zombies);
 606                         }
 607
 608                         kiblnd_del_peer_locked(peer_ni);
 609                         rc = 0;         /* matched something */
 610                 }
 611         }
 612
 613         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 614
 615         kiblnd_txlist_done(&zombies, -EIO, LNET_MSG_STATUS_LOCAL_ERROR);
 616
 617         return rc;
 618 }
 619
 620 static struct kib_conn *
 621 kiblnd_get_conn_by_idx(struct lnet_ni *ni, int index)
 622 {
 623         struct kib_peer_ni *peer_ni;
 624         struct kib_conn *conn;
 625         int i;
 626         unsigned long flags;
 627
 628         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
 629
 630         hash_for_each(kiblnd_data.kib_peers, i, peer_ni, ibp_list) {
 631                 LASSERT(!kiblnd_peer_idle(peer_ni));
 632
 633                 if (peer_ni->ibp_ni != ni)
 634                         continue;
 635
 636                 list_for_each_entry(conn, &peer_ni->ibp_conns,
 637                                     ibc_list) {
 638                         if (index-- > 0)
 639                                 continue;
 640
 641                         kiblnd_conn_addref(conn);
 642                         read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
 643                                                flags);
 644                         return conn;
 645                 }
 646         }
 647
 648         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
 649         return NULL;
 650 }
 651
 652 static void
 653 kiblnd_setup_mtu_locked(struct rdma_cm_id *cmid)
 654 {
 655         /* XXX There is no path record for iWARP, set by netdev->change_mtu? */
 656         if (cmid->route.path_rec == NULL)
 657                 return;
 658
 659         if (*kiblnd_tunables.kib_ib_mtu)
 660                 cmid->route.path_rec->mtu =
 661                         ib_mtu_int_to_enum(*kiblnd_tunables.kib_ib_mtu);
 662 }
 663
 664 static int
 665 kiblnd_get_completion_vector(struct kib_conn *conn, int cpt)
 666 {
 667         cpumask_var_t   *mask;
 668         int             vectors;
 669         int             off;
 670         int             i;
 671         lnet_nid_t      ibp_nid;
 672
 673         vectors = conn->ibc_cmid->device->num_comp_vectors;
 674         if (vectors <= 1)
 675                 return 0;
 676
 677         mask = cfs_cpt_cpumask(lnet_cpt_table(), cpt);
 678
 679         /* hash NID to CPU id in this partition... when targeting a single peer
 680          * with multiple QPs, to engage more cores in CQ processing to a single
 681          * peer, use ibp_nconns to salt the value the comp_vector value
 682          */
 683         ibp_nid = conn->ibc_peer->ibp_nid +
 684                 atomic_read(&conn->ibc_peer->ibp_nconns);
 685         off = do_div(ibp_nid, cpumask_weight(*mask));
 686         for_each_cpu(i, *mask) {
 687                 if (off-- == 0)
 688                         return i % vectors;
 689         }
 690
 691         LBUG();
 692         return 1;
 693 }
 694
 695 /*
 696  * Get the scheduler bound to this CPT. If the scheduler has no
 697  * threads, which means that the CPT has no CPUs, then grab the
 698  * next scheduler that we can use.
 699  *
 700  * This case would be triggered if a NUMA node is configured with
 701  * no associated CPUs.
 702  */
 703 static struct kib_sched_info *
 704 kiblnd_get_scheduler(int cpt)
 705 {
 706         struct kib_sched_info *sched;
 707         int i;
 708
 709         sched = kiblnd_data.kib_scheds[cpt];
 710
 711         if (sched->ibs_nthreads > 0)
 712                 return sched;
 713
 714         cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds) {
 715                 if (sched->ibs_nthreads > 0) {
 716                         CDEBUG(D_NET, "scheduler[%d] has no threads. selected scheduler[%d]\n",
 717                                         cpt, sched->ibs_cpt);
 718                         return sched;
 719                 }
 720         }
 721
 722         return NULL;
 723 }
 724
 725 static unsigned int kiblnd_send_wrs(struct kib_conn *conn)
 726 {
 727         /*
 728          * One WR for the LNet message
 729          * And ibc_max_frags for the transfer WRs
 730          */
 731         int ret;
 732         int multiplier = 1 + conn->ibc_max_frags;
 733
 734         /* FastReg needs two extra WRs for map and invalidate */
 735         if (IS_FAST_REG_DEV(conn->ibc_hdev->ibh_dev))
 736                 multiplier += 2;
 737
 738         /* account for a maximum of ibc_queue_depth in-flight transfers */
 739         ret = multiplier * conn->ibc_queue_depth;
 740
 741         if (ret > conn->ibc_hdev->ibh_max_qp_wr) {
 742                 CDEBUG(D_NET, "peer_credits %u will result in send work "
 743                        "request size %d larger than maximum %d device "
 744                        "can handle\n", conn->ibc_queue_depth, ret,
 745                        conn->ibc_hdev->ibh_max_qp_wr);
 746                 conn->ibc_queue_depth =
 747                         conn->ibc_hdev->ibh_max_qp_wr / multiplier;
 748         }
 749
 750         /* don't go beyond the maximum the device can handle */
 751         return min(ret, conn->ibc_hdev->ibh_max_qp_wr);
 752 }
 753
 754 struct kib_conn *
 755 kiblnd_create_conn(struct kib_peer_ni *peer_ni, struct rdma_cm_id *cmid,
 756                    int state, int version)
 757 {
 758         /* CAVEAT EMPTOR:
 759          * If the new conn is created successfully it takes over the caller's
 760          * ref on 'peer_ni'.  It also "owns" 'cmid' and destroys it when it itself
 761          * is destroyed.  On failure, the caller's ref on 'peer_ni' remains and
 762          * she must dispose of 'cmid'.  (Actually I'd block forever if I tried
 763          * to destroy 'cmid' here since I'm called from the CM which still has
 764          * its ref on 'cmid'). */
 765         rwlock_t               *glock = &kiblnd_data.kib_global_lock;
 766         struct kib_net              *net = peer_ni->ibp_ni->ni_data;
 767         struct kib_dev *dev;
 768         struct ib_qp_init_attr init_qp_attr = {};
 769         struct kib_sched_info   *sched;
 770 #ifdef HAVE_OFED_IB_CQ_INIT_ATTR
 771         struct ib_cq_init_attr  cq_attr = {};
 772 #endif
 773         struct kib_conn *conn;
 774         struct ib_cq            *cq;
 775         unsigned long           flags;
 776         int                     cpt;
 777         int                     rc;
 778         int                     i;
 779
 780         LASSERT(net != NULL);
 781         LASSERT(!in_interrupt());
 782
 783         dev = net->ibn_dev;
 784
 785         cpt = lnet_cpt_of_nid(peer_ni->ibp_nid, peer_ni->ibp_ni);
 786         sched = kiblnd_get_scheduler(cpt);
 787
 788         if (sched == NULL) {
 789                 CERROR("no schedulers available. node is unhealthy\n");
 790                 goto failed_0;
 791         }
 792
 793         /*
 794          * The cpt might have changed if we ended up selecting a non cpt
 795          * native scheduler. So use the scheduler's cpt instead.
 796          */
 797         cpt = sched->ibs_cpt;
 798
 799         LIBCFS_CPT_ALLOC(conn, lnet_cpt_table(), cpt, sizeof(*conn));
 800         if (conn == NULL) {
 801                 CERROR("Can't allocate connection for %s\n",
 802                        libcfs_nid2str(peer_ni->ibp_nid));
 803                 goto failed_0;
 804         }
 805
 806         conn->ibc_state = IBLND_CONN_INIT;
 807         conn->ibc_version = version;
 808         conn->ibc_peer = peer_ni;                       /* I take the caller's ref */
 809         cmid->context = conn;                   /* for future CM callbacks */
 810         conn->ibc_cmid = cmid;
 811         conn->ibc_max_frags = peer_ni->ibp_max_frags;
 812         conn->ibc_queue_depth = peer_ni->ibp_queue_depth;
 813         conn->ibc_rxs = NULL;
 814         conn->ibc_rx_pages = NULL;
 815
 816         INIT_LIST_HEAD(&conn->ibc_early_rxs);
 817         INIT_LIST_HEAD(&conn->ibc_tx_noops);
 818         INIT_LIST_HEAD(&conn->ibc_tx_queue);
 819         INIT_LIST_HEAD(&conn->ibc_tx_queue_rsrvd);
 820         INIT_LIST_HEAD(&conn->ibc_tx_queue_nocred);
 821         INIT_LIST_HEAD(&conn->ibc_active_txs);
 822         INIT_LIST_HEAD(&conn->ibc_zombie_txs);
 823         spin_lock_init(&conn->ibc_lock);
 824
 825         LIBCFS_CPT_ALLOC(conn->ibc_connvars, lnet_cpt_table(), cpt,
 826                          sizeof(*conn->ibc_connvars));
 827         if (conn->ibc_connvars == NULL) {
 828                 CERROR("Can't allocate in-progress connection state\n");
 829                 goto failed_2;
 830         }
 831
 832         write_lock_irqsave(glock, flags);
 833         if (dev->ibd_failover) {
 834                 write_unlock_irqrestore(glock, flags);
 835                 CERROR("%s: failover in progress\n", dev->ibd_ifname);
 836                 goto failed_2;
 837         }
 838
 839         if (dev->ibd_hdev->ibh_ibdev != cmid->device) {
 840                 /* wakeup failover thread and teardown connection */
 841                 if (kiblnd_dev_can_failover(dev)) {
 842                         list_add_tail(&dev->ibd_fail_list,
 843                                       &kiblnd_data.kib_failed_devs);
 844                         wake_up(&kiblnd_data.kib_failover_waitq);
 845                 }
 846
 847                 write_unlock_irqrestore(glock, flags);
 848                 CERROR("cmid HCA(%s), kib_dev(%s) need failover\n",
 849                        cmid->device->name, dev->ibd_ifname);
 850                 goto failed_2;
 851         }
 852
 853         kiblnd_hdev_addref_locked(dev->ibd_hdev);
 854         conn->ibc_hdev = dev->ibd_hdev;
 855
 856         kiblnd_setup_mtu_locked(cmid);
 857
 858         write_unlock_irqrestore(glock, flags);
 859
 860 #ifdef HAVE_OFED_IB_CQ_INIT_ATTR
 861         cq_attr.cqe = IBLND_CQ_ENTRIES(conn);
 862         cq_attr.comp_vector = kiblnd_get_completion_vector(conn, cpt);
 863         cq = ib_create_cq(cmid->device,
 864                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 865                           &cq_attr);
 866 #else
 867         cq = ib_create_cq(cmid->device,
 868                           kiblnd_cq_completion, kiblnd_cq_event, conn,
 869                           IBLND_CQ_ENTRIES(conn),
 870                           kiblnd_get_completion_vector(conn, cpt));
 871 #endif
 872         if (IS_ERR(cq)) {
 873                 /*
 874                  * on MLX-5 (possibly MLX-4 as well) this error could be
 875                  * hit if the concurrent_sends and/or peer_tx_credits is set
 876                  * too high. Or due to an MLX-5 bug which tries to
 877                  * allocate 256kb via kmalloc for WR cookie array
 878                  */
 879                 CERROR("Failed to create CQ with %d CQEs: %ld\n",
 880                         IBLND_CQ_ENTRIES(conn), PTR_ERR(cq));
 881                 goto failed_2;
 882         }
 883
 884         conn->ibc_cq = cq;
 885
 886         rc = ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 887         if (rc != 0) {
 888                 CERROR("Can't request completion notification: %d\n", rc);
 889                 goto failed_2;
 890         }
 891
 892         init_qp_attr.event_handler = kiblnd_qp_event;
 893         init_qp_attr.qp_context = conn;
 894         init_qp_attr.cap.max_send_sge = *kiblnd_tunables.kib_wrq_sge;
 895         init_qp_attr.cap.max_recv_sge = 1;
 896         init_qp_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
 897         init_qp_attr.qp_type = IB_QPT_RC;
 898         init_qp_attr.send_cq = cq;
 899         init_qp_attr.recv_cq = cq;
 900
 901         if (peer_ni->ibp_queue_depth_mod &&
 902             peer_ni->ibp_queue_depth_mod < peer_ni->ibp_queue_depth) {
 903                 conn->ibc_queue_depth = peer_ni->ibp_queue_depth_mod;
 904                 CDEBUG(D_NET, "Use reduced queue depth %u (from %u)\n",
 905                        peer_ni->ibp_queue_depth_mod,
 906                        peer_ni->ibp_queue_depth);
 907         }
 908
 909         do {
 910                 /* kiblnd_send_wrs() can change the connection's queue depth if
 911                  * the maximum work requests for the device is maxed out
 912                  */
 913                 init_qp_attr.cap.max_send_wr = kiblnd_send_wrs(conn);
 914                 init_qp_attr.cap.max_recv_wr = IBLND_RECV_WRS(conn);
 915                 rc = rdma_create_qp(cmid, conn->ibc_hdev->ibh_pd,
 916                                     &init_qp_attr);
 917                 if (rc != -ENOMEM || conn->ibc_queue_depth < 2)
 918                         break;
 919                 conn->ibc_queue_depth--;
 920         } while (rc);
 921
 922         if (rc) {
 923                 CERROR("Can't create QP: %d, send_wr: %d, recv_wr: %d, "
 924                        "send_sge: %d, recv_sge: %d\n",
 925                        rc, init_qp_attr.cap.max_send_wr,
 926                        init_qp_attr.cap.max_recv_wr,
 927                        init_qp_attr.cap.max_send_sge,
 928                        init_qp_attr.cap.max_recv_sge);
 929                 goto failed_2;
 930         }
 931
 932         conn->ibc_sched = sched;
 933
 934         if (!peer_ni->ibp_queue_depth_mod &&
 935             conn->ibc_queue_depth != peer_ni->ibp_queue_depth) {
 936                 CWARN("peer %s - queue depth reduced from %u to %u"
 937                       "  to allow for qp creation\n",
 938                       libcfs_nid2str(peer_ni->ibp_nid),
 939                       peer_ni->ibp_queue_depth,
 940                       conn->ibc_queue_depth);
 941                 peer_ni->ibp_queue_depth_mod = conn->ibc_queue_depth;
 942         }
 943
 944         LIBCFS_CPT_ALLOC(conn->ibc_rxs, lnet_cpt_table(), cpt,
 945                          IBLND_RX_MSGS(conn) * sizeof(struct kib_rx));
 946         if (conn->ibc_rxs == NULL) {
 947                 CERROR("Cannot allocate RX buffers\n");
 948                 goto failed_2;
 949         }
 950
 951         rc = kiblnd_alloc_pages(&conn->ibc_rx_pages, cpt,
 952                                 IBLND_RX_MSG_PAGES(conn));
 953         if (rc != 0)
 954                 goto failed_2;
 955
 956         kiblnd_map_rx_descs(conn);
 957
 958         /* 1 ref for caller and each rxmsg */
 959         atomic_set(&conn->ibc_refcount, 1 + IBLND_RX_MSGS(conn));
 960         conn->ibc_nrx = IBLND_RX_MSGS(conn);
 961
 962         /* post receives */
 963         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
 964                 rc = kiblnd_post_rx(&conn->ibc_rxs[i], IBLND_POSTRX_NO_CREDIT);
 965                 if (rc != 0) {
 966                         CERROR("Can't post rxmsg: %d\n", rc);
 967
 968                         /* Make posted receives complete */
 969                         kiblnd_abort_receives(conn);
 970
 971                         /* correct # of posted buffers
 972                          * NB locking needed now I'm racing with completion */
 973                         spin_lock_irqsave(&sched->ibs_lock, flags);
 974                         conn->ibc_nrx -= IBLND_RX_MSGS(conn) - i;
 975                         spin_unlock_irqrestore(&sched->ibs_lock, flags);
 976
 977                         /* cmid will be destroyed by CM(ofed) after cm_callback
 978                          * returned, so we can't refer it anymore
 979                          * (by kiblnd_connd()->kiblnd_destroy_conn) */
 980                         rdma_destroy_qp(conn->ibc_cmid);
 981                         conn->ibc_cmid = NULL;
 982
 983                         /* Drop my own and unused rxbuffer refcounts */
 984                         while (i++ <= IBLND_RX_MSGS(conn))
 985                                 kiblnd_conn_decref(conn);
 986
 987                         return NULL;
 988                 }
 989         }
 990
 991         /* Init successful! */
 992         LASSERT (state == IBLND_CONN_ACTIVE_CONNECT ||
 993                  state == IBLND_CONN_PASSIVE_WAIT);
 994         conn->ibc_state = state;
 995
 996         /* 1 more conn */
 997         atomic_inc(&peer_ni->ibp_nconns);
 998         atomic_inc(&net->ibn_nconns);
 999         return conn;
1000
1001  failed_2:
1002         kiblnd_destroy_conn(conn);
1003         LIBCFS_FREE(conn, sizeof(*conn));
1004  failed_0:
1005         return NULL;
1006 }
1007
1008 void
1009 kiblnd_destroy_conn(struct kib_conn *conn)
1010 {
1011         struct rdma_cm_id *cmid = conn->ibc_cmid;
1012         struct kib_peer_ni *peer_ni = conn->ibc_peer;
1013
1014         LASSERT (!in_interrupt());
1015         LASSERT (atomic_read(&conn->ibc_refcount) == 0);
1016         LASSERT(list_empty(&conn->ibc_early_rxs));
1017         LASSERT(list_empty(&conn->ibc_tx_noops));
1018         LASSERT(list_empty(&conn->ibc_tx_queue));
1019         LASSERT(list_empty(&conn->ibc_tx_queue_rsrvd));
1020         LASSERT(list_empty(&conn->ibc_tx_queue_nocred));
1021         LASSERT(list_empty(&conn->ibc_active_txs));
1022         LASSERT (conn->ibc_noops_posted == 0);
1023         LASSERT (conn->ibc_nsends_posted == 0);
1024
1025         switch (conn->ibc_state) {
1026         default:
1027                 /* conn must be completely disengaged from the network */
1028                 LBUG();
1029
1030         case IBLND_CONN_DISCONNECTED:
1031                 /* connvars should have been freed already */
1032                 LASSERT (conn->ibc_connvars == NULL);
1033                 break;
1034
1035         case IBLND_CONN_INIT:
1036                 break;
1037         }
1038
1039         /* conn->ibc_cmid might be destroyed by CM already */
1040         if (cmid != NULL && cmid->qp != NULL)
1041                 rdma_destroy_qp(cmid);
1042
1043         if (conn->ibc_cq)
1044                 ib_destroy_cq(conn->ibc_cq);
1045
1046         kiblnd_txlist_done(&conn->ibc_zombie_txs, -ECONNABORTED,
1047                            LNET_MSG_STATUS_OK);
1048
1049         if (conn->ibc_rx_pages != NULL)
1050                 kiblnd_unmap_rx_descs(conn);
1051
1052         if (conn->ibc_rxs != NULL)
1053                 CFS_FREE_PTR_ARRAY(conn->ibc_rxs, IBLND_RX_MSGS(conn));
1054
1055         if (conn->ibc_connvars != NULL)
1056                 LIBCFS_FREE(conn->ibc_connvars, sizeof(*conn->ibc_connvars));
1057
1058         if (conn->ibc_hdev != NULL)
1059                 kiblnd_hdev_decref(conn->ibc_hdev);
1060
1061         /* See CAVEAT EMPTOR above in kiblnd_create_conn */
1062         if (conn->ibc_state != IBLND_CONN_INIT) {
1063                 struct kib_net *net = peer_ni->ibp_ni->ni_data;
1064
1065                 kiblnd_peer_decref(peer_ni);
1066                 rdma_destroy_id(cmid);
1067                 atomic_dec(&peer_ni->ibp_nconns);
1068                 atomic_dec(&net->ibn_nconns);
1069         }
1070 }
1071
1072 int
1073 kiblnd_close_peer_conns_locked(struct kib_peer_ni *peer_ni, int why)
1074 {
1075         struct kib_conn *conn;
1076         struct kib_conn *cnxt;
1077         int count = 0;
1078
1079         list_for_each_entry_safe(conn, cnxt, &peer_ni->ibp_conns,
1080                                  ibc_list) {
1081                 CDEBUG(D_NET, "Closing conn -> %s, "
1082                               "version: %x, reason: %d\n",
1083                        libcfs_nid2str(peer_ni->ibp_nid),
1084                        conn->ibc_version, why);
1085
1086                 kiblnd_close_conn_locked(conn, why);
1087                 count++;
1088         }
1089
1090         return count;
1091 }
1092
1093 int
1094 kiblnd_close_stale_conns_locked(struct kib_peer_ni *peer_ni,
1095                                 int version, __u64 incarnation)
1096 {
1097         struct kib_conn *conn;
1098         struct kib_conn *cnxt;
1099         int count = 0;
1100
1101         list_for_each_entry_safe(conn, cnxt, &peer_ni->ibp_conns,
1102                                  ibc_list) {
1103                 if (conn->ibc_version     == version &&
1104                     conn->ibc_incarnation == incarnation)
1105                         continue;
1106
1107                 CDEBUG(D_NET, "Closing stale conn -> %s version: %x, "
1108                               "incarnation:%#llx(%x, %#llx)\n",
1109                        libcfs_nid2str(peer_ni->ibp_nid),
1110                        conn->ibc_version, conn->ibc_incarnation,
1111                        version, incarnation);
1112
1113                 kiblnd_close_conn_locked(conn, -ESTALE);
1114                 count++;
1115         }
1116
1117         return count;
1118 }
1119
1120 static int
1121 kiblnd_close_matching_conns(struct lnet_ni *ni, lnet_nid_t nid)
1122 {
1123         struct kib_peer_ni *peer_ni;
1124         struct hlist_node *pnxt;
1125         int lo;
1126         int hi;
1127         int i;
1128         unsigned long flags;
1129         int count = 0;
1130
1131         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1132
1133         if (nid != LNET_NID_ANY) {
1134                 lo = hash_min(nid, HASH_BITS(kiblnd_data.kib_peers));
1135                 hi = lo;
1136         } else {
1137                 lo = 0;
1138                 hi = HASH_SIZE(kiblnd_data.kib_peers) - 1;
1139         }
1140
1141         for (i = lo; i <= hi; i++) {
1142                 hlist_for_each_entry_safe(peer_ni, pnxt,
1143                                           &kiblnd_data.kib_peers[i], ibp_list) {
1144                         LASSERT(!kiblnd_peer_idle(peer_ni));
1145
1146                         if (peer_ni->ibp_ni != ni)
1147                                 continue;
1148
1149                         if (!(nid == LNET_NID_ANY || nid == peer_ni->ibp_nid))
1150                                 continue;
1151
1152                         count += kiblnd_close_peer_conns_locked(peer_ni, 0);
1153                 }
1154         }
1155
1156         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1157
1158         /* wildcards always succeed */
1159         if (nid == LNET_NID_ANY)
1160                 return 0;
1161
1162         return (count == 0) ? -ENOENT : 0;
1163 }
1164
1165 static int
1166 kiblnd_ctl(struct lnet_ni *ni, unsigned int cmd, void *arg)
1167 {
1168         struct libcfs_ioctl_data *data = arg;
1169         int                       rc = -EINVAL;
1170
1171         switch(cmd) {
1172         case IOC_LIBCFS_GET_PEER: {
1173                 lnet_nid_t   nid = 0;
1174                 int          count = 0;
1175
1176                 rc = kiblnd_get_peer_info(ni, data->ioc_nid, data->ioc_count,
1177                                           &nid, &count);
1178                 data->ioc_nid    = nid;
1179                 data->ioc_count  = count;
1180                 break;
1181         }
1182
1183         case IOC_LIBCFS_DEL_PEER: {
1184                 rc = kiblnd_del_peer(ni, data->ioc_nid);
1185                 break;
1186         }
1187         case IOC_LIBCFS_GET_CONN: {
1188                 struct kib_conn *conn;
1189
1190                 rc = 0;
1191                 conn = kiblnd_get_conn_by_idx(ni, data->ioc_count);
1192                 if (conn == NULL) {
1193                         rc = -ENOENT;
1194                         break;
1195                 }
1196
1197                 LASSERT(conn->ibc_cmid != NULL);
1198                 data->ioc_nid = conn->ibc_peer->ibp_nid;
1199                 if (conn->ibc_cmid->route.path_rec == NULL)
1200                         data->ioc_u32[0] = 0; /* iWarp has no path MTU */
1201                 else
1202                         data->ioc_u32[0] =
1203                         ib_mtu_enum_to_int(conn->ibc_cmid->route.path_rec->mtu);
1204                 kiblnd_conn_decref(conn);
1205                 break;
1206         }
1207         case IOC_LIBCFS_CLOSE_CONNECTION: {
1208                 rc = kiblnd_close_matching_conns(ni, data->ioc_nid);
1209                 break;
1210         }
1211
1212         default:
1213                 break;
1214         }
1215
1216         return rc;
1217 }
1218
1219 static const struct ln_key_list kiblnd_tunables_keys = {
1220         .lkl_maxattr                    = LNET_NET_O2IBLND_TUNABLES_ATTR_MAX,
1221         .lkl_list                       = {
1222                 [LNET_NET_O2IBLND_TUNABLES_ATTR_HIW_PEER_CREDITS]  = {
1223                         .lkp_value      = "peercredits_hiw",
1224                         .lkp_data_type  = NLA_U32
1225                 },
1226                 [LNET_NET_O2IBLND_TUNABLES_ATTR_MAP_ON_DEMAND]  = {
1227                         .lkp_value      = "map_on_demand",
1228                         .lkp_data_type  = NLA_FLAG
1229                 },
1230                 [LNET_NET_O2IBLND_TUNABLES_ATTR_CONCURRENT_SENDS]  = {
1231                         .lkp_value      = "concurrent_sends",
1232                         .lkp_data_type  = NLA_U32
1233                 },
1234                 [LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_POOL_SIZE]  = {
1235                         .lkp_value      = "fmr_pool_size",
1236                         .lkp_data_type  = NLA_U32
1237                 },
1238                 [LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_FLUSH_TRIGGER]  = {
1239                         .lkp_value      = "fmr_flush_trigger",
1240                         .lkp_data_type  = NLA_U32
1241                 },
1242                 [LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_CACHE]  = {
1243                         .lkp_value      = "fmr_cache",
1244                         .lkp_data_type  = NLA_U32
1245                 },
1246                 [LNET_NET_O2IBLND_TUNABLES_ATTR_NTX]  = {
1247                         .lkp_value      = "ntx",
1248                         .lkp_data_type  = NLA_U16
1249                 },
1250                 [LNET_NET_O2IBLND_TUNABLES_ATTR_CONNS_PER_PEER]  = {
1251                         .lkp_value      = "conns_per_peer",
1252                         .lkp_data_type  = NLA_U16
1253                 },
1254                 [LNET_NET_O2IBLND_TUNABLES_ATTR_LND_TIMEOUT] = {
1255                         .lkp_value      = "timeout",
1256                         .lkp_data_type  = NLA_U32,
1257                 },
1258         },
1259 };
1260
1261 static int
1262 kiblnd_nl_get(int cmd, struct sk_buff *msg, int type, void *data)
1263 {
1264         struct lnet_ioctl_config_o2iblnd_tunables *tuns;
1265         struct lnet_ni *ni = data;
1266
1267         if (!ni || !msg)
1268                 return -EINVAL;
1269
1270         if (cmd != LNET_CMD_NETS || type != LNET_NET_LOCAL_NI_ATTR_LND_TUNABLES)
1271                 return -EOPNOTSUPP;
1272
1273         tuns = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
1274         nla_put_u32(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_HIW_PEER_CREDITS,
1275                     tuns->lnd_peercredits_hiw);
1276         if (tuns->lnd_map_on_demand) {
1277                 nla_put_flag(msg,
1278                              LNET_NET_O2IBLND_TUNABLES_ATTR_MAP_ON_DEMAND);
1279         }
1280         nla_put_u32(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_CONCURRENT_SENDS,
1281                     tuns->lnd_concurrent_sends);
1282         nla_put_u32(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_POOL_SIZE,
1283                     tuns->lnd_fmr_pool_size);
1284         nla_put_u32(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_FLUSH_TRIGGER,
1285                     tuns->lnd_fmr_flush_trigger);
1286         nla_put_u32(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_CACHE,
1287                     tuns->lnd_fmr_cache);
1288         nla_put_u16(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_NTX, tuns->lnd_ntx);
1289         nla_put_u16(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_CONNS_PER_PEER,
1290                     tuns->lnd_conns_per_peer);
1291         nla_put_u32(msg, LNET_NET_O2IBLND_TUNABLES_ATTR_LND_TIMEOUT,
1292                     kiblnd_timeout());
1293
1294         return 0;
1295 }
1296
1297 static inline void
1298 kiblnd_nl_set_default(int cmd, int type, void *data)
1299 {
1300         struct lnet_lnd_tunables *tunables = data;
1301         struct lnet_ioctl_config_o2iblnd_tunables *lt;
1302         struct lnet_ioctl_config_o2iblnd_tunables *df;
1303
1304         lt = &tunables->lnd_tun_u.lnd_o2ib;
1305         df = &kib_default_tunables;
1306         switch (type) {
1307         case LNET_NET_O2IBLND_TUNABLES_ATTR_HIW_PEER_CREDITS:
1308                 lt->lnd_peercredits_hiw = df->lnd_peercredits_hiw;
1309                 break;
1310         case LNET_NET_O2IBLND_TUNABLES_ATTR_MAP_ON_DEMAND:
1311                 lt->lnd_map_on_demand = df->lnd_map_on_demand;
1312                 break;
1313         case LNET_NET_O2IBLND_TUNABLES_ATTR_CONCURRENT_SENDS:
1314                 lt->lnd_concurrent_sends = df->lnd_concurrent_sends;
1315                 break;
1316         case LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_POOL_SIZE:
1317                 lt->lnd_fmr_pool_size = df->lnd_fmr_pool_size;
1318                 break;
1319         case LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_FLUSH_TRIGGER:
1320                 lt->lnd_fmr_flush_trigger = df->lnd_fmr_flush_trigger;
1321                 break;
1322         case LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_CACHE:
1323                 lt->lnd_fmr_cache = df->lnd_fmr_cache;
1324                 break;
1325         case LNET_NET_O2IBLND_TUNABLES_ATTR_NTX:
1326                 lt->lnd_ntx = df->lnd_ntx;
1327                 break;
1328         case LNET_NET_O2IBLND_TUNABLES_ATTR_LND_TIMEOUT:
1329                 lt->lnd_timeout = df->lnd_timeout;
1330                 break;
1331         case LNET_NET_O2IBLND_TUNABLES_ATTR_CONNS_PER_PEER:
1332                 lt->lnd_conns_per_peer = df->lnd_conns_per_peer;
1333                 fallthrough;
1334         default:
1335                 break;
1336         }
1337
1338 }
1339
1340 static int
1341 kiblnd_nl_set(int cmd, struct nlattr *attr, int type, void *data)
1342 {
1343         struct lnet_lnd_tunables *tunables = data;
1344         int rc = 0;
1345         s64 num;
1346
1347         if (cmd != LNET_CMD_NETS)
1348                 return -EOPNOTSUPP;
1349
1350         if (!attr) {
1351                 kiblnd_nl_set_default(cmd, type, data);
1352                 return 0;
1353         }
1354
1355         if (nla_type(attr) != LN_SCALAR_ATTR_INT_VALUE)
1356                 return -EINVAL;
1357
1358         switch (type) {
1359         case LNET_NET_O2IBLND_TUNABLES_ATTR_HIW_PEER_CREDITS:
1360                 tunables->lnd_tun_u.lnd_o2ib.lnd_peercredits_hiw = nla_get_s64(attr);
1361                 break;
1362         case LNET_NET_O2IBLND_TUNABLES_ATTR_MAP_ON_DEMAND:
1363                 tunables->lnd_tun_u.lnd_o2ib.lnd_map_on_demand = nla_get_s64(attr);
1364                 break;
1365         case LNET_NET_O2IBLND_TUNABLES_ATTR_CONCURRENT_SENDS:
1366                 tunables->lnd_tun_u.lnd_o2ib.lnd_concurrent_sends = nla_get_s64(attr);
1367                 break;
1368         case LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_POOL_SIZE:
1369                 tunables->lnd_tun_u.lnd_o2ib.lnd_fmr_pool_size = nla_get_s64(attr);
1370                 break;
1371         case LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_FLUSH_TRIGGER:
1372                 tunables->lnd_tun_u.lnd_o2ib.lnd_fmr_flush_trigger = nla_get_s64(attr);
1373                 break;
1374         case LNET_NET_O2IBLND_TUNABLES_ATTR_FMR_CACHE:
1375                 tunables->lnd_tun_u.lnd_o2ib.lnd_fmr_cache = nla_get_s64(attr);
1376                 break;
1377         case LNET_NET_O2IBLND_TUNABLES_ATTR_NTX:
1378                 tunables->lnd_tun_u.lnd_o2ib.lnd_ntx = nla_get_s64(attr);
1379                 break;
1380         case LNET_NET_O2IBLND_TUNABLES_ATTR_LND_TIMEOUT:
1381                 tunables->lnd_tun_u.lnd_o2ib.lnd_timeout = nla_get_s64(attr);
1382                 break;
1383         case LNET_NET_O2IBLND_TUNABLES_ATTR_CONNS_PER_PEER:
1384                 num = nla_get_s64(attr);
1385                 if (num >= 0 && num < 128)
1386                         tunables->lnd_tun_u.lnd_o2ib.lnd_conns_per_peer = num;
1387                 else
1388                         rc = -ERANGE;
1389                 fallthrough;
1390         default:
1391                 break;
1392         }
1393
1394         return rc;
1395 }
1396
1397 static void
1398 kiblnd_free_pages(struct kib_pages *p)
1399 {
1400         int     npages = p->ibp_npages;
1401         int     i;
1402
1403         for (i = 0; i < npages; i++) {
1404                 if (p->ibp_pages[i] != NULL)
1405                         __free_page(p->ibp_pages[i]);
1406         }
1407
1408         LIBCFS_FREE(p, offsetof(struct kib_pages, ibp_pages[npages]));
1409 }
1410
1411 int
1412 kiblnd_alloc_pages(struct kib_pages **pp, int cpt, int npages)
1413 {
1414         struct kib_pages *p;
1415         int i;
1416
1417         LIBCFS_CPT_ALLOC(p, lnet_cpt_table(), cpt,
1418                          offsetof(struct kib_pages, ibp_pages[npages]));
1419         if (p == NULL) {
1420                 CERROR("Can't allocate descriptor for %d pages\n", npages);
1421                 return -ENOMEM;
1422         }
1423
1424         memset(p, 0, offsetof(struct kib_pages, ibp_pages[npages]));
1425         p->ibp_npages = npages;
1426
1427         for (i = 0; i < npages; i++) {
1428                 p->ibp_pages[i] = cfs_page_cpt_alloc(lnet_cpt_table(), cpt,
1429                                                      GFP_NOFS);
1430                 if (p->ibp_pages[i] == NULL) {
1431                         CERROR("Can't allocate page %d of %d\n", i, npages);
1432                         kiblnd_free_pages(p);
1433                         return -ENOMEM;
1434                 }
1435         }
1436
1437         *pp = p;
1438         return 0;
1439 }
1440
1441 void
1442 kiblnd_unmap_rx_descs(struct kib_conn *conn)
1443 {
1444         struct kib_rx *rx;
1445         int       i;
1446
1447         LASSERT (conn->ibc_rxs != NULL);
1448         LASSERT (conn->ibc_hdev != NULL);
1449
1450         for (i = 0; i < IBLND_RX_MSGS(conn); i++) {
1451                 rx = &conn->ibc_rxs[i];
1452
1453                 LASSERT(rx->rx_nob >= 0); /* not posted */
1454
1455                 kiblnd_dma_unmap_single(conn->ibc_hdev->ibh_ibdev,
1456                                         KIBLND_UNMAP_ADDR(rx, rx_msgunmap,
1457                                                           rx->rx_msgaddr),
1458                                         IBLND_MSG_SIZE, DMA_FROM_DEVICE);
1459         }
1460
1461         kiblnd_free_pages(conn->ibc_rx_pages);
1462
1463         conn->ibc_rx_pages = NULL;
1464 }
1465
1466 void
1467 kiblnd_map_rx_descs(struct kib_conn *conn)
1468 {
1469         struct kib_rx *rx;
1470         struct page    *pg;
1471         int             pg_off;
1472         int             ipg;
1473         int             i;
1474
1475         for (pg_off = ipg = i = 0; i < IBLND_RX_MSGS(conn); i++) {
1476                 pg = conn->ibc_rx_pages->ibp_pages[ipg];
1477                 rx = &conn->ibc_rxs[i];
1478
1479                 rx->rx_conn = conn;
1480                 rx->rx_msg = (struct kib_msg *)(((char *)page_address(pg)) + pg_off);
1481
1482                 rx->rx_msgaddr =
1483                         kiblnd_dma_map_single(conn->ibc_hdev->ibh_ibdev,
1484                                               rx->rx_msg, IBLND_MSG_SIZE,
1485                                               DMA_FROM_DEVICE);
1486                 LASSERT(!kiblnd_dma_mapping_error(conn->ibc_hdev->ibh_ibdev,
1487                                                   rx->rx_msgaddr));
1488                 KIBLND_UNMAP_ADDR_SET(rx, rx_msgunmap, rx->rx_msgaddr);
1489
1490                 CDEBUG(D_NET, "rx %d: %p %#llx(%#llx)\n",
1491                        i, rx->rx_msg, rx->rx_msgaddr,
1492                        (__u64)(page_to_phys(pg) + pg_off));
1493
1494                 pg_off += IBLND_MSG_SIZE;
1495                 LASSERT(pg_off <= PAGE_SIZE);
1496
1497                 if (pg_off == PAGE_SIZE) {
1498                         pg_off = 0;
1499                         ipg++;
1500                         LASSERT(ipg <= IBLND_RX_MSG_PAGES(conn));
1501                 }
1502         }
1503 }
1504
1505 static void
1506 kiblnd_unmap_tx_pool(struct kib_tx_pool *tpo)
1507 {
1508         struct kib_hca_dev *hdev = tpo->tpo_hdev;
1509         struct kib_tx *tx;
1510         int i;
1511
1512         LASSERT (tpo->tpo_pool.po_allocated == 0);
1513
1514         if (hdev == NULL)
1515                 return;
1516
1517         for (i = 0; i < tpo->tpo_pool.po_size; i++) {
1518                 tx = &tpo->tpo_tx_descs[i];
1519                 kiblnd_dma_unmap_single(hdev->ibh_ibdev,
1520                                         KIBLND_UNMAP_ADDR(tx, tx_msgunmap,
1521                                                           tx->tx_msgaddr),
1522                                         IBLND_MSG_SIZE, DMA_TO_DEVICE);
1523         }
1524
1525         kiblnd_hdev_decref(hdev);
1526         tpo->tpo_hdev = NULL;
1527 }
1528
1529 static struct kib_hca_dev *
1530 kiblnd_current_hdev(struct kib_dev *dev)
1531 {
1532         struct kib_hca_dev *hdev;
1533         unsigned long  flags;
1534         int            i = 0;
1535
1536         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1537         while (dev->ibd_failover) {
1538                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1539                 if (i++ % 50 == 0)
1540                         CDEBUG(D_NET, "%s: Wait for failover\n",
1541                                dev->ibd_ifname);
1542                 schedule_timeout_interruptible(cfs_time_seconds(1) / 100);
1543
1544                 read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
1545         }
1546
1547         kiblnd_hdev_addref_locked(dev->ibd_hdev);
1548         hdev = dev->ibd_hdev;
1549
1550         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
1551
1552         return hdev;
1553 }
1554
1555 static void
1556 kiblnd_map_tx_pool(struct kib_tx_pool *tpo)
1557 {
1558         struct kib_pages *txpgs = tpo->tpo_tx_pages;
1559         struct kib_pool *pool = &tpo->tpo_pool;
1560         struct kib_net      *net   = pool->po_owner->ps_net;
1561         struct kib_dev *dev;
1562         struct page *page;
1563         struct kib_tx *tx;
1564         int             page_offset;
1565         int             ipage;
1566         int             i;
1567
1568         LASSERT (net != NULL);
1569
1570         dev = net->ibn_dev;
1571
1572         /* pre-mapped messages are not bigger than 1 page */
1573         BUILD_BUG_ON(IBLND_MSG_SIZE > PAGE_SIZE);
1574
1575         /* No fancy arithmetic when we do the buffer calculations */
1576         BUILD_BUG_ON(PAGE_SIZE % IBLND_MSG_SIZE != 0);
1577
1578         tpo->tpo_hdev = kiblnd_current_hdev(dev);
1579
1580         for (ipage = page_offset = i = 0; i < pool->po_size; i++) {
1581                 page = txpgs->ibp_pages[ipage];
1582                 tx = &tpo->tpo_tx_descs[i];
1583
1584                 tx->tx_msg = (struct kib_msg *)(((char *)page_address(page)) +
1585                                                 page_offset);
1586
1587                 tx->tx_msgaddr = kiblnd_dma_map_single(tpo->tpo_hdev->ibh_ibdev,
1588                                                        tx->tx_msg,
1589                                                        IBLND_MSG_SIZE,
1590                                                        DMA_TO_DEVICE);
1591                 LASSERT(!kiblnd_dma_mapping_error(tpo->tpo_hdev->ibh_ibdev,
1592                                                   tx->tx_msgaddr));
1593                 KIBLND_UNMAP_ADDR_SET(tx, tx_msgunmap, tx->tx_msgaddr);
1594
1595                 list_add(&tx->tx_list, &pool->po_free_list);
1596
1597                 page_offset += IBLND_MSG_SIZE;
1598                 LASSERT(page_offset <= PAGE_SIZE);
1599
1600                 if (page_offset == PAGE_SIZE) {
1601                         page_offset = 0;
1602                         ipage++;
1603                         LASSERT(ipage <= txpgs->ibp_npages);
1604                 }
1605         }
1606 }
1607
1608 static void
1609 kiblnd_destroy_fmr_pool(struct kib_fmr_pool *fpo)
1610 {
1611         LASSERT(fpo->fpo_map_count == 0);
1612
1613 #ifdef HAVE_OFED_FMR_POOL_API
1614         if (fpo->fpo_is_fmr && fpo->fmr.fpo_fmr_pool) {
1615                 ib_destroy_fmr_pool(fpo->fmr.fpo_fmr_pool);
1616         } else
1617 #endif /* HAVE_OFED_FMR_POOL_API */
1618         {
1619                 struct kib_fast_reg_descriptor *frd, *tmp;
1620                 int i = 0;
1621
1622                 list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1623                                          frd_list) {
1624                         list_del(&frd->frd_list);
1625 #ifndef HAVE_OFED_IB_MAP_MR_SG
1626                         ib_free_fast_reg_page_list(frd->frd_frpl);
1627 #endif
1628                         ib_dereg_mr(frd->frd_mr);
1629                         LIBCFS_FREE(frd, sizeof(*frd));
1630                         i++;
1631                 }
1632                 if (i < fpo->fast_reg.fpo_pool_size)
1633                         CERROR("FastReg pool still has %d regions registered\n",
1634                                 fpo->fast_reg.fpo_pool_size - i);
1635         }
1636
1637         if (fpo->fpo_hdev)
1638                 kiblnd_hdev_decref(fpo->fpo_hdev);
1639
1640         LIBCFS_FREE(fpo, sizeof(*fpo));
1641 }
1642
1643 static void
1644 kiblnd_destroy_fmr_pool_list(struct list_head *head)
1645 {
1646         struct kib_fmr_pool *fpo, *tmp;
1647
1648         list_for_each_entry_safe(fpo, tmp, head, fpo_list) {
1649                 list_del(&fpo->fpo_list);
1650                 kiblnd_destroy_fmr_pool(fpo);
1651         }
1652 }
1653
1654 static int
1655 kiblnd_fmr_pool_size(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1656                      int ncpts)
1657 {
1658         int size = tunables->lnd_fmr_pool_size / ncpts;
1659
1660         return max(IBLND_FMR_POOL, size);
1661 }
1662
1663 static int
1664 kiblnd_fmr_flush_trigger(struct lnet_ioctl_config_o2iblnd_tunables *tunables,
1665                          int ncpts)
1666 {
1667         int size = tunables->lnd_fmr_flush_trigger / ncpts;
1668
1669         return max(IBLND_FMR_POOL_FLUSH, size);
1670 }
1671
1672 #ifdef HAVE_OFED_FMR_POOL_API
1673 static int kiblnd_alloc_fmr_pool(struct kib_fmr_poolset *fps,
1674                                  struct kib_fmr_pool *fpo)
1675 {
1676         struct ib_fmr_pool_param param = {
1677                 .max_pages_per_fmr = IBLND_MAX_RDMA_FRAGS,
1678                 .page_shift        = PAGE_SHIFT,
1679                 .access            = (IB_ACCESS_LOCAL_WRITE |
1680                                       IB_ACCESS_REMOTE_WRITE),
1681                 .pool_size         = fps->fps_pool_size,
1682                 .dirty_watermark   = fps->fps_flush_trigger,
1683                 .flush_function    = NULL,
1684                 .flush_arg         = NULL,
1685                 .cache             = !!fps->fps_cache };
1686         int rc = 0;
1687
1688         fpo->fmr.fpo_fmr_pool = ib_create_fmr_pool(fpo->fpo_hdev->ibh_pd,
1689                                                    &param);
1690         if (IS_ERR(fpo->fmr.fpo_fmr_pool)) {
1691                 rc = PTR_ERR(fpo->fmr.fpo_fmr_pool);
1692                 if (rc != -ENOSYS)
1693                         CERROR("Failed to create FMR pool: %d\n", rc);
1694                 else
1695                         CERROR("FMRs are not supported\n");
1696         }
1697         fpo->fpo_is_fmr = true;
1698
1699         return rc;
1700 }
1701 #endif /* HAVE_OFED_FMR_POOL_API */
1702
1703 static int kiblnd_alloc_freg_pool(struct kib_fmr_poolset *fps,
1704                                   struct kib_fmr_pool *fpo,
1705                                   enum kib_dev_caps dev_caps)
1706 {
1707         struct kib_fast_reg_descriptor *frd, *tmp;
1708         int i, rc;
1709
1710 #ifdef HAVE_OFED_FMR_POOL_API
1711         fpo->fpo_is_fmr = false;
1712 #endif
1713
1714         INIT_LIST_HEAD(&fpo->fast_reg.fpo_pool_list);
1715         fpo->fast_reg.fpo_pool_size = 0;
1716         for (i = 0; i < fps->fps_pool_size; i++) {
1717                 LIBCFS_CPT_ALLOC(frd, lnet_cpt_table(), fps->fps_cpt,
1718                                  sizeof(*frd));
1719                 if (!frd) {
1720                         CERROR("Failed to allocate a new fast_reg descriptor\n");
1721                         rc = -ENOMEM;
1722                         goto out;
1723                 }
1724                 frd->frd_mr = NULL;
1725
1726 #ifndef HAVE_OFED_IB_MAP_MR_SG
1727                 frd->frd_frpl = ib_alloc_fast_reg_page_list(fpo->fpo_hdev->ibh_ibdev,
1728                                                             IBLND_MAX_RDMA_FRAGS);
1729                 if (IS_ERR(frd->frd_frpl)) {
1730                         rc = PTR_ERR(frd->frd_frpl);
1731                         CERROR("Failed to allocate ib_fast_reg_page_list: %d\n",
1732                                 rc);
1733                         frd->frd_frpl = NULL;
1734                         goto out_middle;
1735                 }
1736 #endif
1737
1738 #ifdef HAVE_OFED_IB_ALLOC_FAST_REG_MR
1739                 frd->frd_mr = ib_alloc_fast_reg_mr(fpo->fpo_hdev->ibh_pd,
1740                                                    IBLND_MAX_RDMA_FRAGS);
1741 #else
1742                 /*
1743                  * it is expected to get here if this is an MLX-5 card.
1744                  * MLX-4 cards will always use FMR and MLX-5 cards will
1745                  * always use fast_reg. It turns out that some MLX-5 cards
1746                  * (possibly due to older FW versions) do not natively support
1747                  * gaps. So we will need to track them here.
1748                  */
1749                 frd->frd_mr = ib_alloc_mr(fpo->fpo_hdev->ibh_pd,
1750 #ifdef IB_MR_TYPE_SG_GAPS
1751                                           ((*kiblnd_tunables.kib_use_fastreg_gaps == 1) &&
1752                                            (dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT)) ?
1753                                                 IB_MR_TYPE_SG_GAPS :
1754                                                 IB_MR_TYPE_MEM_REG,
1755 #else
1756                                                 IB_MR_TYPE_MEM_REG,
1757 #endif
1758                                           IBLND_MAX_RDMA_FRAGS);
1759                 if ((*kiblnd_tunables.kib_use_fastreg_gaps == 1) &&
1760                     (dev_caps & IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT))
1761                         CWARN("using IB_MR_TYPE_SG_GAPS, expect a performance drop\n");
1762 #endif
1763                 if (IS_ERR(frd->frd_mr)) {
1764                         rc = PTR_ERR(frd->frd_mr);
1765                         CERROR("Failed to allocate ib_fast_reg_mr: %d\n", rc);
1766                         frd->frd_mr = NULL;
1767                         goto out_middle;
1768                 }
1769
1770                 /* indicate that the local invalidate needs to be generated */
1771                 frd->frd_valid = false;
1772
1773                 list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1774                 fpo->fast_reg.fpo_pool_size++;
1775         }
1776
1777         return 0;
1778
1779 out_middle:
1780         if (frd->frd_mr)
1781                 ib_dereg_mr(frd->frd_mr);
1782 #ifndef HAVE_OFED_IB_MAP_MR_SG
1783         if (frd->frd_frpl)
1784                 ib_free_fast_reg_page_list(frd->frd_frpl);
1785 #endif
1786         LIBCFS_FREE(frd, sizeof(*frd));
1787
1788 out:
1789         list_for_each_entry_safe(frd, tmp, &fpo->fast_reg.fpo_pool_list,
1790                                  frd_list) {
1791                 list_del(&frd->frd_list);
1792 #ifndef HAVE_OFED_IB_MAP_MR_SG
1793                 ib_free_fast_reg_page_list(frd->frd_frpl);
1794 #endif
1795                 ib_dereg_mr(frd->frd_mr);
1796                 LIBCFS_FREE(frd, sizeof(*frd));
1797         }
1798
1799         return rc;
1800 }
1801
1802 static int kiblnd_create_fmr_pool(struct kib_fmr_poolset *fps,
1803                                   struct kib_fmr_pool **pp_fpo)
1804 {
1805         struct kib_dev *dev = fps->fps_net->ibn_dev;
1806         struct kib_fmr_pool *fpo;
1807         int rc;
1808
1809         LIBCFS_CPT_ALLOC(fpo, lnet_cpt_table(), fps->fps_cpt, sizeof(*fpo));
1810         if (!fpo) {
1811                 return -ENOMEM;
1812         }
1813         memset(fpo, 0, sizeof(*fpo));
1814
1815         fpo->fpo_hdev = kiblnd_current_hdev(dev);
1816
1817 #ifdef HAVE_OFED_FMR_POOL_API
1818         if (dev->ibd_dev_caps & IBLND_DEV_CAPS_FMR_ENABLED)
1819                 rc = kiblnd_alloc_fmr_pool(fps, fpo);
1820         else
1821 #endif /* HAVE_OFED_FMR_POOL_API */
1822                 rc = kiblnd_alloc_freg_pool(fps, fpo, dev->ibd_dev_caps);
1823         if (rc)
1824                 goto out_fpo;
1825
1826         fpo->fpo_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
1827         fpo->fpo_owner = fps;
1828         *pp_fpo = fpo;
1829
1830         return 0;
1831
1832 out_fpo:
1833         kiblnd_hdev_decref(fpo->fpo_hdev);
1834         LIBCFS_FREE(fpo, sizeof(*fpo));
1835         return rc;
1836 }
1837
1838 static void
1839 kiblnd_fail_fmr_poolset(struct kib_fmr_poolset *fps, struct list_head *zombies)
1840 {
1841         struct kib_fmr_pool *fpo;
1842
1843         if (fps->fps_net == NULL) /* intialized? */
1844                 return;
1845
1846         spin_lock(&fps->fps_lock);
1847
1848         while ((fpo = list_first_entry_or_null(&fps->fps_pool_list,
1849                                                struct kib_fmr_pool,
1850                                                fpo_list)) != NULL) {
1851                 fpo->fpo_failed = 1;
1852                 if (fpo->fpo_map_count == 0)
1853                         list_move(&fpo->fpo_list, zombies);
1854                 else
1855                         list_move(&fpo->fpo_list, &fps->fps_failed_pool_list);
1856         }
1857
1858         spin_unlock(&fps->fps_lock);
1859 }
1860
1861 static void
1862 kiblnd_fini_fmr_poolset(struct kib_fmr_poolset *fps)
1863 {
1864         if (fps->fps_net != NULL) { /* initialized? */
1865                 kiblnd_destroy_fmr_pool_list(&fps->fps_failed_pool_list);
1866                 kiblnd_destroy_fmr_pool_list(&fps->fps_pool_list);
1867         }
1868 }
1869
1870 static int
1871 kiblnd_init_fmr_poolset(struct kib_fmr_poolset *fps, int cpt, int ncpts,
1872                         struct kib_net *net,
1873                         struct lnet_ioctl_config_o2iblnd_tunables *tunables)
1874 {
1875         struct kib_fmr_pool *fpo;
1876         int rc;
1877
1878         memset(fps, 0, sizeof(struct kib_fmr_poolset));
1879
1880         fps->fps_net = net;
1881         fps->fps_cpt = cpt;
1882
1883         fps->fps_pool_size = kiblnd_fmr_pool_size(tunables, ncpts);
1884         fps->fps_flush_trigger = kiblnd_fmr_flush_trigger(tunables, ncpts);
1885         fps->fps_cache = tunables->lnd_fmr_cache;
1886
1887         spin_lock_init(&fps->fps_lock);
1888         INIT_LIST_HEAD(&fps->fps_pool_list);
1889         INIT_LIST_HEAD(&fps->fps_failed_pool_list);
1890
1891         rc = kiblnd_create_fmr_pool(fps, &fpo);
1892         if (rc == 0)
1893                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
1894
1895         return rc;
1896 }
1897
1898 static int
1899 kiblnd_fmr_pool_is_idle(struct kib_fmr_pool *fpo, time64_t now)
1900 {
1901         if (fpo->fpo_map_count != 0) /* still in use */
1902                 return 0;
1903         if (fpo->fpo_failed)
1904                 return 1;
1905         return now >= fpo->fpo_deadline;
1906 }
1907
1908 #if defined(HAVE_OFED_FMR_POOL_API) || !defined(HAVE_OFED_IB_MAP_MR_SG)
1909 static int
1910 kiblnd_map_tx_pages(struct kib_tx *tx, struct kib_rdma_desc *rd)
1911 {
1912         struct kib_hca_dev *hdev;
1913         __u64           *pages = tx->tx_pages;
1914         int             npages;
1915         int             size;
1916         int             i;
1917
1918         hdev = tx->tx_pool->tpo_hdev;
1919
1920         for (i = 0, npages = 0; i < rd->rd_nfrags; i++) {
1921                 for (size = 0; size <  rd->rd_frags[i].rf_nob;
1922                         size += hdev->ibh_page_size) {
1923                         pages[npages++] = (rd->rd_frags[i].rf_addr &
1924                                            hdev->ibh_page_mask) + size;
1925                 }
1926         }
1927
1928         return npages;
1929 }
1930 #endif
1931
1932 void
1933 kiblnd_fmr_pool_unmap(struct kib_fmr *fmr, int status)
1934 {
1935         LIST_HEAD(zombies);
1936         struct kib_fmr_pool *fpo = fmr->fmr_pool;
1937         struct kib_fmr_poolset *fps;
1938         time64_t now = ktime_get_seconds();
1939         struct kib_fmr_pool *tmp;
1940
1941         if (!fpo)
1942                 return;
1943
1944         fps = fpo->fpo_owner;
1945
1946 #ifdef HAVE_OFED_FMR_POOL_API
1947         if (fpo->fpo_is_fmr) {
1948                 if (fmr->fmr_pfmr) {
1949                         ib_fmr_pool_unmap(fmr->fmr_pfmr);
1950                         fmr->fmr_pfmr = NULL;
1951                 }
1952
1953                 if (status) {
1954                         int rc = ib_flush_fmr_pool(fpo->fmr.fpo_fmr_pool);
1955                         LASSERT(!rc);
1956                 }
1957         } else
1958 #endif /* HAVE_OFED_FMR_POOL_API */
1959         {
1960                 struct kib_fast_reg_descriptor *frd = fmr->fmr_frd;
1961                 if (frd) {
1962                         frd->frd_posted = false;
1963                         fmr->fmr_frd = NULL;
1964                         spin_lock(&fps->fps_lock);
1965                         list_add_tail(&frd->frd_list, &fpo->fast_reg.fpo_pool_list);
1966                         spin_unlock(&fps->fps_lock);
1967                 }
1968         }
1969         fmr->fmr_pool = NULL;
1970
1971         spin_lock(&fps->fps_lock);
1972         fpo->fpo_map_count--;   /* decref the pool */
1973
1974         list_for_each_entry_safe(fpo, tmp, &fps->fps_pool_list, fpo_list) {
1975                 /* the first pool is persistent */
1976                 if (fps->fps_pool_list.next == &fpo->fpo_list)
1977                         continue;
1978
1979                 if (kiblnd_fmr_pool_is_idle(fpo, now)) {
1980                         list_move(&fpo->fpo_list, &zombies);
1981                         fps->fps_version++;
1982                 }
1983         }
1984         spin_unlock(&fps->fps_lock);
1985
1986         if (!list_empty(&zombies))
1987                 kiblnd_destroy_fmr_pool_list(&zombies);
1988 }
1989
1990 int kiblnd_fmr_pool_map(struct kib_fmr_poolset *fps, struct kib_tx *tx,
1991                         struct kib_rdma_desc *rd, u32 nob, u64 iov,
1992                         struct kib_fmr *fmr)
1993 {
1994         struct kib_fmr_pool *fpo;
1995         __u64 version;
1996         bool is_rx = (rd != tx->tx_rd);
1997 #ifdef HAVE_OFED_FMR_POOL_API
1998         __u64 *pages = tx->tx_pages;
1999         bool tx_pages_mapped = false;
2000         int npages = 0;
2001 #endif
2002         int rc;
2003
2004 again:
2005         spin_lock(&fps->fps_lock);
2006         version = fps->fps_version;
2007         list_for_each_entry(fpo, &fps->fps_pool_list, fpo_list) {
2008                 fpo->fpo_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
2009                 fpo->fpo_map_count++;
2010
2011 #ifdef HAVE_OFED_FMR_POOL_API
2012                 fmr->fmr_pfmr = NULL;
2013                 if (fpo->fpo_is_fmr) {
2014                         struct ib_pool_fmr *pfmr;
2015
2016                         spin_unlock(&fps->fps_lock);
2017
2018                         if (!tx_pages_mapped) {
2019                                 npages = kiblnd_map_tx_pages(tx, rd);
2020                                 tx_pages_mapped = true;
2021                         }
2022
2023                         pfmr = kib_fmr_pool_map(fpo->fmr.fpo_fmr_pool,
2024                                                 pages, npages, iov);
2025                         if (likely(!IS_ERR(pfmr))) {
2026                                 fmr->fmr_key  = is_rx ? pfmr->fmr->rkey
2027                                         : pfmr->fmr->lkey;
2028                                 fmr->fmr_frd  = NULL;
2029                                 fmr->fmr_pfmr = pfmr;
2030                                 fmr->fmr_pool = fpo;
2031                                 return 0;
2032                         }
2033                         rc = PTR_ERR(pfmr);
2034                 } else
2035 #endif /* HAVE_OFED_FMR_POOL_API */
2036                 {
2037                         if (!list_empty(&fpo->fast_reg.fpo_pool_list)) {
2038                                 struct kib_fast_reg_descriptor *frd;
2039 #ifdef HAVE_OFED_IB_MAP_MR_SG
2040                                 struct ib_reg_wr *wr;
2041                                 int n;
2042 #else
2043                                 struct ib_rdma_wr *wr;
2044                                 struct ib_fast_reg_page_list *frpl;
2045 #endif
2046                                 struct ib_mr *mr;
2047
2048                                 frd = list_first_entry(
2049                                         &fpo->fast_reg.fpo_pool_list,
2050                                         struct kib_fast_reg_descriptor,
2051                                         frd_list);
2052                                 list_del(&frd->frd_list);
2053                                 spin_unlock(&fps->fps_lock);
2054
2055 #ifndef HAVE_OFED_IB_MAP_MR_SG
2056                                 frpl = frd->frd_frpl;
2057 #endif
2058                                 mr   = frd->frd_mr;
2059
2060                                 if (!frd->frd_valid) {
2061                                         struct ib_rdma_wr *inv_wr;
2062                                         __u32 key = is_rx ? mr->rkey : mr->lkey;
2063
2064                                         frd->frd_valid = true;
2065                                         inv_wr = &frd->frd_inv_wr;
2066                                         memset(inv_wr, 0, sizeof(*inv_wr));
2067
2068                                         inv_wr->wr.opcode = IB_WR_LOCAL_INV;
2069                                         inv_wr->wr.wr_id  = IBLND_WID_MR;
2070                                         inv_wr->wr.ex.invalidate_rkey = key;
2071
2072                                         /* Bump the key */
2073                                         key = ib_inc_rkey(key);
2074                                         ib_update_fast_reg_key(mr, key);
2075                                 }
2076
2077 #ifdef HAVE_OFED_IB_MAP_MR_SG
2078 #ifdef HAVE_OFED_IB_MAP_MR_SG_5ARGS
2079                                 n = ib_map_mr_sg(mr, tx->tx_frags,
2080                                                  rd->rd_nfrags, NULL, PAGE_SIZE);
2081 #else
2082                                 n = ib_map_mr_sg(mr, tx->tx_frags,
2083                                                  rd->rd_nfrags, PAGE_SIZE);
2084 #endif /* HAVE_OFED_IB_MAP_MR_SG_5ARGS */
2085                                 if (unlikely(n != rd->rd_nfrags)) {
2086                                         CERROR("Failed to map mr %d/%d elements\n",
2087                                                n, rd->rd_nfrags);
2088                                         return n < 0 ? n : -EINVAL;
2089                                 }
2090
2091                                 wr = &frd->frd_fastreg_wr;
2092                                 memset(wr, 0, sizeof(*wr));
2093
2094                                 wr->wr.opcode = IB_WR_REG_MR;
2095                                 wr->wr.wr_id  = IBLND_WID_MR;
2096                                 wr->wr.num_sge = 0;
2097                                 wr->wr.send_flags = 0;
2098                                 wr->mr = mr;
2099                                 wr->key = is_rx ? mr->rkey : mr->lkey;
2100                                 wr->access = (IB_ACCESS_LOCAL_WRITE |
2101                                               IB_ACCESS_REMOTE_WRITE);
2102 #else /* HAVE_OFED_IB_MAP_MR_SG */
2103                                 if (!tx_pages_mapped) {
2104                                         npages = kiblnd_map_tx_pages(tx, rd);
2105                                         tx_pages_mapped = true;
2106                                 }
2107
2108                                 LASSERT(npages <= frpl->max_page_list_len);
2109                                 memcpy(frpl->page_list, pages,
2110                                        sizeof(*pages) * npages);
2111
2112                                 /* Prepare FastReg WR */
2113                                 wr = &frd->frd_fastreg_wr;
2114                                 memset(wr, 0, sizeof(*wr));
2115
2116                                 wr->wr.opcode = IB_WR_FAST_REG_MR;
2117                                 wr->wr.wr_id  = IBLND_WID_MR;
2118
2119                                 wr->wr.wr.fast_reg.iova_start = iov;
2120                                 wr->wr.wr.fast_reg.page_list  = frpl;
2121                                 wr->wr.wr.fast_reg.page_list_len = npages;
2122                                 wr->wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2123                                 wr->wr.wr.fast_reg.length = nob;
2124                                 wr->wr.wr.fast_reg.rkey =
2125                                         is_rx ? mr->rkey : mr->lkey;
2126                                 wr->wr.wr.fast_reg.access_flags =
2127                                         (IB_ACCESS_LOCAL_WRITE |
2128                                          IB_ACCESS_REMOTE_WRITE);
2129 #endif /* HAVE_OFED_IB_MAP_MR_SG */
2130
2131                                 fmr->fmr_key  = is_rx ? mr->rkey : mr->lkey;
2132                                 fmr->fmr_frd  = frd;
2133                                 fmr->fmr_pool = fpo;
2134                                 frd->frd_posted = false;
2135                                 return 0;
2136                         }
2137                         spin_unlock(&fps->fps_lock);
2138                         rc = -EAGAIN;
2139                 }
2140
2141                 spin_lock(&fps->fps_lock);
2142                 fpo->fpo_map_count--;
2143                 if (rc != -EAGAIN) {
2144                         spin_unlock(&fps->fps_lock);
2145                         return rc;
2146                 }
2147
2148                 /* EAGAIN and ... */
2149                 if (version != fps->fps_version) {
2150                         spin_unlock(&fps->fps_lock);
2151                         goto again;
2152                 }
2153         }
2154
2155         if (fps->fps_increasing) {
2156                 spin_unlock(&fps->fps_lock);
2157                 CDEBUG(D_NET, "Another thread is allocating new "
2158                        "FMR pool, waiting for her to complete\n");
2159                 wait_var_event(fps, !fps->fps_increasing);
2160                 goto again;
2161
2162         }
2163
2164         if (ktime_get_seconds() < fps->fps_next_retry) {
2165                 /* someone failed recently */
2166                 spin_unlock(&fps->fps_lock);
2167                 return -EAGAIN;
2168         }
2169
2170         fps->fps_increasing = 1;
2171         spin_unlock(&fps->fps_lock);
2172
2173         CDEBUG(D_NET, "Allocate new FMR pool\n");
2174         rc = kiblnd_create_fmr_pool(fps, &fpo);
2175         spin_lock(&fps->fps_lock);
2176         fps->fps_increasing = 0;
2177         wake_up_var(fps);
2178         if (rc == 0) {
2179                 fps->fps_version++;
2180                 list_add_tail(&fpo->fpo_list, &fps->fps_pool_list);
2181         } else {
2182                 fps->fps_next_retry = ktime_get_seconds() + IBLND_POOL_RETRY;
2183         }
2184         spin_unlock(&fps->fps_lock);
2185
2186         goto again;
2187 }
2188
2189 static void
2190 kiblnd_fini_pool(struct kib_pool *pool)
2191 {
2192         LASSERT(list_empty(&pool->po_free_list));
2193         LASSERT(pool->po_allocated == 0);
2194
2195         CDEBUG(D_NET, "Finalize %s pool\n", pool->po_owner->ps_name);
2196 }
2197
2198 static void
2199 kiblnd_init_pool(struct kib_poolset *ps, struct kib_pool *pool, int size)
2200 {
2201         CDEBUG(D_NET, "Initialize %s pool\n", ps->ps_name);
2202
2203         memset(pool, 0, sizeof(struct kib_pool));
2204         INIT_LIST_HEAD(&pool->po_free_list);
2205         pool->po_deadline = ktime_get_seconds() + IBLND_POOL_DEADLINE;
2206         pool->po_owner = ps;
2207         pool->po_size = size;
2208 }
2209
2210 static void
2211 kiblnd_destroy_pool_list(struct list_head *head)
2212 {
2213         struct kib_pool *pool;
2214
2215         while ((pool = list_first_entry_or_null(head,
2216                                                 struct kib_pool,
2217                                                 po_list)) != NULL) {
2218                 list_del(&pool->po_list);
2219
2220                 LASSERT(pool->po_owner != NULL);
2221                 pool->po_owner->ps_pool_destroy(pool);
2222         }
2223 }
2224
2225 static void
2226 kiblnd_fail_poolset(struct kib_poolset *ps, struct list_head *zombies)
2227 {
2228         struct kib_pool *po;
2229
2230         if (ps->ps_net == NULL) /* intialized? */
2231                 return;
2232
2233         spin_lock(&ps->ps_lock);
2234         while ((po = list_first_entry_or_null(&ps->ps_pool_list,
2235                                               struct kib_pool,
2236                                               po_list)) != NULL) {
2237                 po->po_failed = 1;
2238                 if (po->po_allocated == 0)
2239                         list_move(&po->po_list, zombies);
2240                 else
2241                         list_move(&po->po_list, &ps->ps_failed_pool_list);
2242         }
2243         spin_unlock(&ps->ps_lock);
2244 }
2245
2246 static void
2247 kiblnd_fini_poolset(struct kib_poolset *ps)
2248 {
2249         if (ps->ps_net != NULL) { /* initialized? */
2250                 kiblnd_destroy_pool_list(&ps->ps_failed_pool_list);
2251                 kiblnd_destroy_pool_list(&ps->ps_pool_list);
2252         }
2253 }
2254
2255 static int
2256 kiblnd_init_poolset(struct kib_poolset *ps, int cpt,
2257                     struct kib_net *net, char *name, int size,
2258                     kib_ps_pool_create_t po_create,
2259                     kib_ps_pool_destroy_t po_destroy,
2260                     kib_ps_node_init_t nd_init,
2261                     kib_ps_node_fini_t nd_fini)
2262 {
2263         struct kib_pool *pool;
2264         int rc;
2265
2266         memset(ps, 0, sizeof(struct kib_poolset));
2267
2268         ps->ps_cpt          = cpt;
2269         ps->ps_net          = net;
2270         ps->ps_pool_create  = po_create;
2271         ps->ps_pool_destroy = po_destroy;
2272         ps->ps_node_init    = nd_init;
2273         ps->ps_node_fini    = nd_fini;
2274         ps->ps_pool_size    = size;
2275         if (strlcpy(ps->ps_name, name, sizeof(ps->ps_name))
2276             >= sizeof(ps->ps_name))
2277                 return -E2BIG;
2278         spin_lock_init(&ps->ps_lock);
2279         INIT_LIST_HEAD(&ps->ps_pool_list);
2280         INIT_LIST_HEAD(&ps->ps_failed_pool_list);
2281
2282         rc = ps->ps_pool_create(ps, size, &pool);
2283         if (rc == 0)
2284                 list_add(&pool->po_list, &ps->ps_pool_list);
2285         else
2286                 CERROR("Failed to create the first pool for %s\n", ps->ps_name);
2287
2288         return rc;
2289 }
2290
2291 static int
2292 kiblnd_pool_is_idle(struct kib_pool *pool, time64_t now)
2293 {
2294         if (pool->po_allocated != 0) /* still in use */
2295                 return 0;
2296         if (pool->po_failed)
2297                 return 1;
2298         return now >= pool->po_deadline;
2299 }
2300
2301 void
2302 kiblnd_pool_free_node(struct kib_pool *pool, struct list_head *node)
2303 {
2304         LIST_HEAD(zombies);
2305         struct kib_poolset *ps = pool->po_owner;
2306         struct kib_pool *tmp;
2307         time64_t now = ktime_get_seconds();
2308
2309         spin_lock(&ps->ps_lock);
2310
2311         if (ps->ps_node_fini != NULL)
2312                 ps->ps_node_fini(pool, node);
2313
2314         LASSERT(pool->po_allocated > 0);
2315         list_add(node, &pool->po_free_list);
2316         pool->po_allocated--;
2317
2318         list_for_each_entry_safe(pool, tmp, &ps->ps_pool_list, po_list) {
2319                 /* the first pool is persistent */
2320                 if (ps->ps_pool_list.next == &pool->po_list)
2321                         continue;
2322
2323                 if (kiblnd_pool_is_idle(pool, now))
2324                         list_move(&pool->po_list, &zombies);
2325         }
2326         spin_unlock(&ps->ps_lock);
2327
2328         if (!list_empty(&zombies))
2329                 kiblnd_destroy_pool_list(&zombies);
2330 }
2331
2332 struct list_head *
2333 kiblnd_pool_alloc_node(struct kib_poolset *ps)
2334 {
2335         struct list_head        *node;
2336         struct kib_pool *pool;
2337         int                     rc;
2338         unsigned int            interval = 1;
2339         ktime_t time_before;
2340         unsigned int trips = 0;
2341
2342 again:
2343         spin_lock(&ps->ps_lock);
2344         list_for_each_entry(pool, &ps->ps_pool_list, po_list) {
2345                 if (list_empty(&pool->po_free_list))
2346                         continue;
2347
2348                 pool->po_allocated++;
2349                 pool->po_deadline = ktime_get_seconds() +
2350                                     IBLND_POOL_DEADLINE;
2351                 node = pool->po_free_list.next;
2352                 list_del(node);
2353
2354                 if (ps->ps_node_init != NULL) {
2355                         /* still hold the lock */
2356                         ps->ps_node_init(pool, node);
2357                 }
2358                 spin_unlock(&ps->ps_lock);
2359                 return node;
2360         }
2361
2362         /* no available tx pool and ... */
2363         if (ps->ps_increasing) {
2364                 /* another thread is allocating a new pool */
2365                 spin_unlock(&ps->ps_lock);
2366                 trips++;
2367                 CDEBUG(D_NET,
2368                        "Another thread is allocating new %s pool, waiting %d jiffies for her to complete. trips = %d\n",
2369                        ps->ps_name, interval, trips);
2370
2371                 schedule_timeout_interruptible(interval);
2372                 if (interval < cfs_time_seconds(1))
2373                         interval *= 2;
2374
2375                 goto again;
2376         }
2377
2378         if (ktime_get_seconds() < ps->ps_next_retry) {
2379                 /* someone failed recently */
2380                 spin_unlock(&ps->ps_lock);
2381                 return NULL;
2382         }
2383
2384         ps->ps_increasing = 1;
2385         spin_unlock(&ps->ps_lock);
2386
2387         CDEBUG(D_NET, "%s pool exhausted, allocate new pool\n", ps->ps_name);
2388         time_before = ktime_get();
2389         rc = ps->ps_pool_create(ps, ps->ps_pool_size, &pool);
2390         CDEBUG(D_NET, "ps_pool_create took %lld ms to complete\n",
2391                ktime_ms_delta(ktime_get(), time_before));
2392
2393         spin_lock(&ps->ps_lock);
2394         ps->ps_increasing = 0;
2395         if (rc == 0) {
2396                 list_add_tail(&pool->po_list, &ps->ps_pool_list);
2397         } else {
2398                 ps->ps_next_retry = ktime_get_seconds() + IBLND_POOL_RETRY;
2399                 CERROR("Can't allocate new %s pool because out of memory\n",
2400                        ps->ps_name);
2401         }
2402         spin_unlock(&ps->ps_lock);
2403
2404         goto again;
2405 }
2406
2407 static void
2408 kiblnd_destroy_tx_pool(struct kib_pool *pool)
2409 {
2410         struct kib_tx_pool *tpo = container_of(pool, struct kib_tx_pool,
2411                                                tpo_pool);
2412         int i;
2413
2414         LASSERT (pool->po_allocated == 0);
2415
2416         if (tpo->tpo_tx_pages != NULL) {
2417                 kiblnd_unmap_tx_pool(tpo);
2418                 kiblnd_free_pages(tpo->tpo_tx_pages);
2419         }
2420
2421         if (tpo->tpo_tx_descs == NULL)
2422                 goto out;
2423
2424         for (i = 0; i < pool->po_size; i++) {
2425                 struct kib_tx *tx = &tpo->tpo_tx_descs[i];
2426                 int       wrq_sge = *kiblnd_tunables.kib_wrq_sge;
2427
2428                 list_del(&tx->tx_list);
2429                 if (tx->tx_pages != NULL)
2430                         CFS_FREE_PTR_ARRAY(tx->tx_pages, LNET_MAX_IOV);
2431                 if (tx->tx_frags != NULL)
2432                         CFS_FREE_PTR_ARRAY(tx->tx_frags,
2433                                            IBLND_MAX_RDMA_FRAGS);
2434                 if (tx->tx_wrq != NULL)
2435                         CFS_FREE_PTR_ARRAY(tx->tx_wrq,
2436                                            IBLND_MAX_RDMA_FRAGS);
2437                 if (tx->tx_sge != NULL) {
2438                         /* +1 is for the lnet header/message itself */
2439                         CFS_FREE_PTR_ARRAY(tx->tx_sge,
2440                                            (IBLND_MAX_RDMA_FRAGS *
2441                                            wrq_sge + 1));
2442                 }
2443                 if (tx->tx_rd != NULL)
2444                         LIBCFS_FREE(tx->tx_rd,
2445                                     offsetof(struct kib_rdma_desc,
2446                                              rd_frags[IBLND_MAX_RDMA_FRAGS]));
2447         }
2448
2449         CFS_FREE_PTR_ARRAY(tpo->tpo_tx_descs, pool->po_size);
2450 out:
2451         kiblnd_fini_pool(pool);
2452         CFS_FREE_PTR(tpo);
2453 }
2454
2455 static int kiblnd_tx_pool_size(struct lnet_ni *ni, int ncpts)
2456 {
2457         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2458         int ntx;
2459
2460         tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2461         ntx = tunables->lnd_ntx / ncpts;
2462
2463         return max(IBLND_TX_POOL, ntx);
2464 }
2465
2466 static int
2467 kiblnd_create_tx_pool(struct kib_poolset *ps, int size, struct kib_pool **pp_po)
2468 {
2469         int            i;
2470         int            npg;
2471         struct kib_pool *pool;
2472         struct kib_tx_pool *tpo;
2473
2474         LIBCFS_CPT_ALLOC(tpo, lnet_cpt_table(), ps->ps_cpt, sizeof(*tpo));
2475         if (tpo == NULL) {
2476                 CERROR("Failed to allocate TX pool\n");
2477                 return -ENOMEM;
2478         }
2479
2480         pool = &tpo->tpo_pool;
2481         kiblnd_init_pool(ps, pool, size);
2482         tpo->tpo_tx_descs = NULL;
2483         tpo->tpo_tx_pages = NULL;
2484
2485         npg = (size * IBLND_MSG_SIZE + PAGE_SIZE - 1) / PAGE_SIZE;
2486         if (kiblnd_alloc_pages(&tpo->tpo_tx_pages, ps->ps_cpt, npg) != 0) {
2487                 CERROR("Can't allocate tx pages: %d\n", npg);
2488                 CFS_FREE_PTR(tpo);
2489                 return -ENOMEM;
2490         }
2491
2492         LIBCFS_CPT_ALLOC(tpo->tpo_tx_descs, lnet_cpt_table(), ps->ps_cpt,
2493                          size * sizeof(struct kib_tx));
2494         if (tpo->tpo_tx_descs == NULL) {
2495                 CERROR("Can't allocate %d tx descriptors\n", size);
2496                 ps->ps_pool_destroy(pool);
2497                 return -ENOMEM;
2498         }
2499
2500         memset(tpo->tpo_tx_descs, 0, size * sizeof(struct kib_tx));
2501
2502         for (i = 0; i < size; i++) {
2503                 struct kib_tx *tx = &tpo->tpo_tx_descs[i];
2504                 int       wrq_sge = *kiblnd_tunables.kib_wrq_sge;
2505
2506                 tx->tx_pool = tpo;
2507                 if (ps->ps_net->ibn_fmr_ps != NULL) {
2508                         LIBCFS_CPT_ALLOC(tx->tx_pages,
2509                                          lnet_cpt_table(), ps->ps_cpt,
2510                                          LNET_MAX_IOV * sizeof(*tx->tx_pages));
2511                         if (tx->tx_pages == NULL)
2512                                 break;
2513                 }
2514
2515                 LIBCFS_CPT_ALLOC(tx->tx_frags, lnet_cpt_table(), ps->ps_cpt,
2516                                  IBLND_MAX_RDMA_FRAGS *
2517                                  sizeof(*tx->tx_frags));
2518                 if (tx->tx_frags == NULL)
2519                         break;
2520
2521                 sg_init_table(tx->tx_frags, IBLND_MAX_RDMA_FRAGS);
2522
2523                 LIBCFS_CPT_ALLOC(tx->tx_wrq, lnet_cpt_table(), ps->ps_cpt,
2524                                  IBLND_MAX_RDMA_FRAGS *
2525                                  sizeof(*tx->tx_wrq));
2526                 if (tx->tx_wrq == NULL)
2527                         break;
2528
2529                 /* +1 is for the lnet header/message itself */
2530                 LIBCFS_CPT_ALLOC(tx->tx_sge, lnet_cpt_table(), ps->ps_cpt,
2531                                  (IBLND_MAX_RDMA_FRAGS * wrq_sge + 1) *
2532                                  sizeof(*tx->tx_sge));
2533                 if (tx->tx_sge == NULL)
2534                         break;
2535
2536                 LIBCFS_CPT_ALLOC(tx->tx_rd, lnet_cpt_table(), ps->ps_cpt,
2537                                  offsetof(struct kib_rdma_desc,
2538                                           rd_frags[IBLND_MAX_RDMA_FRAGS]));
2539                 if (tx->tx_rd == NULL)
2540                         break;
2541         }
2542
2543         if (i == size) {
2544                 kiblnd_map_tx_pool(tpo);
2545                 *pp_po = pool;
2546                 return 0;
2547         }
2548
2549         ps->ps_pool_destroy(pool);
2550         return -ENOMEM;
2551 }
2552
2553 static void
2554 kiblnd_tx_init(struct kib_pool *pool, struct list_head *node)
2555 {
2556         struct kib_tx_poolset *tps = container_of(pool->po_owner,
2557                                                   struct kib_tx_poolset,
2558                                                   tps_poolset);
2559         struct kib_tx *tx  = list_entry(node, struct kib_tx, tx_list);
2560
2561         tx->tx_cookie = tps->tps_next_tx_cookie++;
2562 }
2563
2564 static void
2565 kiblnd_net_fini_pools(struct kib_net *net)
2566 {
2567         int     i;
2568
2569         cfs_cpt_for_each(i, lnet_cpt_table()) {
2570                 struct kib_tx_poolset *tps;
2571                 struct kib_fmr_poolset *fps;
2572
2573                 if (net->ibn_tx_ps != NULL) {
2574                         tps = net->ibn_tx_ps[i];
2575                         kiblnd_fini_poolset(&tps->tps_poolset);
2576                 }
2577
2578                 if (net->ibn_fmr_ps != NULL) {
2579                         fps = net->ibn_fmr_ps[i];
2580                         kiblnd_fini_fmr_poolset(fps);
2581                 }
2582         }
2583
2584         if (net->ibn_tx_ps != NULL) {
2585                 cfs_percpt_free(net->ibn_tx_ps);
2586                 net->ibn_tx_ps = NULL;
2587         }
2588
2589         if (net->ibn_fmr_ps != NULL) {
2590                 cfs_percpt_free(net->ibn_fmr_ps);
2591                 net->ibn_fmr_ps = NULL;
2592         }
2593 }
2594
2595 static int
2596 kiblnd_net_init_pools(struct kib_net *net, struct lnet_ni *ni, __u32 *cpts,
2597                       int ncpts)
2598 {
2599         struct lnet_ioctl_config_o2iblnd_tunables *tunables;
2600 #ifdef HAVE_OFED_IB_GET_DMA_MR
2601         unsigned long   flags;
2602 #endif
2603         int             cpt;
2604         int             rc;
2605         int             i;
2606
2607         tunables = &ni->ni_lnd_tunables.lnd_tun_u.lnd_o2ib;
2608
2609 #ifdef HAVE_OFED_IB_GET_DMA_MR
2610         read_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
2611         /*
2612          * if lnd_map_on_demand is zero then we have effectively disabled
2613          * FMR or FastReg and we're using global memory regions
2614          * exclusively.
2615          */
2616         if (!tunables->lnd_map_on_demand) {
2617                 read_unlock_irqrestore(&kiblnd_data.kib_global_lock,
2618                                            flags);
2619                 goto create_tx_pool;
2620         }
2621
2622         read_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
2623 #endif
2624
2625         if (tunables->lnd_fmr_pool_size < tunables->lnd_ntx / 4) {
2626                 CERROR("Can't set fmr pool size (%d) < ntx / 4(%d)\n",
2627                        tunables->lnd_fmr_pool_size,
2628                        tunables->lnd_ntx / 4);
2629                 rc = -EINVAL;
2630                 goto failed;
2631         }
2632
2633         /* TX pool must be created later than FMR, see LU-2268
2634          * for details */
2635         LASSERT(net->ibn_tx_ps == NULL);
2636
2637         /* premapping can fail if ibd_nmr > 1, so we always create
2638          * FMR pool and map-on-demand if premapping failed */
2639
2640         net->ibn_fmr_ps = cfs_percpt_alloc(lnet_cpt_table(),
2641                                            sizeof(struct kib_fmr_poolset));
2642         if (net->ibn_fmr_ps == NULL) {
2643                 CERROR("Failed to allocate FMR pool array\n");
2644                 rc = -ENOMEM;
2645                 goto failed;
2646         }
2647
2648         for (i = 0; i < ncpts; i++) {
2649                 cpt = (cpts == NULL) ? i : cpts[i];
2650                 rc = kiblnd_init_fmr_poolset(net->ibn_fmr_ps[cpt], cpt, ncpts,
2651                                              net, tunables);
2652                 if (rc != 0) {
2653                         CERROR("Can't initialize FMR pool for CPT %d: %d\n",
2654                                cpt, rc);
2655                         goto failed;
2656                 }
2657         }
2658
2659         if (i > 0)
2660                 LASSERT(i == ncpts);
2661
2662 #ifdef HAVE_OFED_IB_GET_DMA_MR
2663  create_tx_pool:
2664 #endif
2665         net->ibn_tx_ps = cfs_percpt_alloc(lnet_cpt_table(),
2666                                           sizeof(struct kib_tx_poolset));
2667         if (net->ibn_tx_ps == NULL) {
2668                 CERROR("Failed to allocate tx pool array\n");
2669                 rc = -ENOMEM;
2670                 goto failed;
2671         }
2672
2673         for (i = 0; i < ncpts; i++) {
2674                 cpt = (cpts == NULL) ? i : cpts[i];
2675                 rc = kiblnd_init_poolset(&net->ibn_tx_ps[cpt]->tps_poolset,
2676                                          cpt, net, "TX",
2677                                          kiblnd_tx_pool_size(ni, ncpts),
2678                                          kiblnd_create_tx_pool,
2679                                          kiblnd_destroy_tx_pool,
2680                                          kiblnd_tx_init, NULL);
2681                 if (rc != 0) {
2682                         CERROR("Can't initialize TX pool for CPT %d: %d\n",
2683                                cpt, rc);
2684                         goto failed;
2685                 }
2686         }
2687
2688         return 0;
2689  failed:
2690         kiblnd_net_fini_pools(net);
2691         LASSERT(rc != 0);
2692         return rc;
2693 }
2694
2695 static int
2696 kiblnd_port_get_attr(struct kib_hca_dev *hdev)
2697 {
2698         struct ib_port_attr *port_attr;
2699         int rc;
2700         unsigned long flags;
2701         rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2702
2703         LIBCFS_ALLOC(port_attr, sizeof(*port_attr));
2704         if (port_attr == NULL) {
2705                 CDEBUG(D_NETERROR, "Out of memory\n");
2706                 return -ENOMEM;
2707         }
2708
2709         rc = ib_query_port(hdev->ibh_ibdev, hdev->ibh_port, port_attr);
2710
2711         write_lock_irqsave(g_lock, flags);
2712
2713         if (rc == 0)
2714                 hdev->ibh_state = port_attr->state == IB_PORT_ACTIVE
2715                                  ? IBLND_DEV_PORT_ACTIVE
2716                                  : IBLND_DEV_PORT_DOWN;
2717
2718         write_unlock_irqrestore(g_lock, flags);
2719         LIBCFS_FREE(port_attr, sizeof(*port_attr));
2720
2721         if (rc != 0) {
2722                 CDEBUG(D_NETERROR, "Failed to query IB port: %d\n", rc);
2723                 return rc;
2724         }
2725         return 0;
2726 }
2727
2728 static inline void
2729 kiblnd_set_ni_fatal_on(struct kib_hca_dev *hdev, int val)
2730 {
2731         struct kib_net  *net;
2732         __u32 ni_state_before;
2733         bool update_ping_buf = false;
2734         struct lnet_ni *ni = NULL;
2735
2736         /* for health check */
2737         list_for_each_entry(net, &hdev->ibh_dev->ibd_nets, ibn_list) {
2738                 ni = net->ibn_ni;
2739                 if (val)
2740                         CDEBUG(D_NETERROR, "Fatal device error for NI %s\n",
2741                                         libcfs_nidstr(&ni->ni_nid));
2742                 ni_state_before = lnet_set_link_fatal_state(ni, val);
2743
2744                 if (!update_ping_buf &&
2745                     (ni->ni_state == LNET_NI_STATE_ACTIVE) &&
2746                     (val != ni_state_before) &&
2747                     (net->ibn_init == IBLND_INIT_ALL))
2748                         update_ping_buf = true;
2749         }
2750
2751         if (update_ping_buf)
2752                 lnet_mark_ping_buffer_for_update();
2753 }
2754
2755 static void
2756 kiblnd_event_handler(struct ib_event_handler *handler, struct ib_event *event)
2757 {
2758         rwlock_t *g_lock = &kiblnd_data.kib_global_lock;
2759         struct kib_hca_dev  *hdev;
2760         unsigned long flags;
2761
2762         hdev = container_of(handler, struct kib_hca_dev, ibh_event_handler);
2763
2764         write_lock_irqsave(g_lock, flags);
2765
2766         switch (event->event) {
2767         case IB_EVENT_DEVICE_FATAL:
2768                 CDEBUG(D_NET, "IB device fatal\n");
2769                 hdev->ibh_state = IBLND_DEV_FATAL;
2770                 kiblnd_set_ni_fatal_on(hdev, 1);
2771                 break;
2772         case IB_EVENT_PORT_ACTIVE:
2773                 CDEBUG(D_NET, "IB port active\n");
2774                 if (event->element.port_num == hdev->ibh_port) {
2775                         hdev->ibh_state = IBLND_DEV_PORT_ACTIVE;
2776                         kiblnd_set_ni_fatal_on(hdev, 0);
2777                 }
2778                 break;
2779         case IB_EVENT_PORT_ERR:
2780                 CDEBUG(D_NET, "IB port err\n");
2781                 if (event->element.port_num == hdev->ibh_port) {
2782                         hdev->ibh_state = IBLND_DEV_PORT_DOWN;
2783                         kiblnd_set_ni_fatal_on(hdev, 1);
2784                 }
2785                 break;
2786         default:
2787                 break;
2788         }
2789         write_unlock_irqrestore(g_lock, flags);
2790 }
2791
2792 static int
2793 kiblnd_hdev_get_attr(struct kib_hca_dev *hdev)
2794 {
2795         struct ib_device_attr *dev_attr;
2796         int rc = 0;
2797         int rc2 = 0;
2798
2799         /* It's safe to assume a HCA can handle a page size
2800          * matching that of the native system */
2801         hdev->ibh_page_shift = PAGE_SHIFT;
2802         hdev->ibh_page_size  = 1 << PAGE_SHIFT;
2803         hdev->ibh_page_mask  = ~((__u64)hdev->ibh_page_size - 1);
2804
2805 #ifndef HAVE_OFED_IB_DEVICE_ATTRS
2806         LIBCFS_ALLOC(dev_attr, sizeof(*dev_attr));
2807         if (dev_attr == NULL) {
2808                 CERROR("Out of memory\n");
2809                 return -ENOMEM;
2810         }
2811
2812         rc = ib_query_device(hdev->ibh_ibdev, dev_attr);
2813         if (rc != 0) {
2814                 CERROR("Failed to query IB device: %d\n", rc);
2815                 goto out_clean_attr;
2816         }
2817 #else
2818         dev_attr = &hdev->ibh_ibdev->attrs;
2819 #endif
2820
2821         hdev->ibh_mr_size = dev_attr->max_mr_size;
2822         hdev->ibh_max_qp_wr = dev_attr->max_qp_wr;
2823
2824         /* Setup device Memory Registration capabilities */
2825 #ifdef HAVE_OFED_FMR_POOL_API
2826 #ifdef HAVE_OFED_IB_DEVICE_OPS
2827         if (hdev->ibh_ibdev->ops.alloc_fmr &&
2828             hdev->ibh_ibdev->ops.dealloc_fmr &&
2829             hdev->ibh_ibdev->ops.map_phys_fmr &&
2830             hdev->ibh_ibdev->ops.unmap_fmr) {
2831 #else
2832         if (hdev->ibh_ibdev->alloc_fmr &&
2833             hdev->ibh_ibdev->dealloc_fmr &&
2834             hdev->ibh_ibdev->map_phys_fmr &&
2835             hdev->ibh_ibdev->unmap_fmr) {
2836 #endif
2837                 LCONSOLE_INFO("Using FMR for registration\n");
2838                 hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FMR_ENABLED;
2839         } else
2840 #endif /* HAVE_OFED_FMR_POOL_API */
2841         if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
2842                 LCONSOLE_INFO("Using FastReg for registration\n");
2843                 hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FASTREG_ENABLED;
2844 #ifndef HAVE_OFED_IB_ALLOC_FAST_REG_MR
2845 #ifdef IB_DEVICE_SG_GAPS_REG
2846                 if (dev_attr->device_cap_flags & IB_DEVICE_SG_GAPS_REG)
2847                         hdev->ibh_dev->ibd_dev_caps |= IBLND_DEV_CAPS_FASTREG_GAPS_SUPPORT;
2848 #endif
2849 #endif
2850         } else {
2851                 rc = -ENOSYS;
2852         }
2853
2854         rc2 = kiblnd_port_get_attr(hdev);
2855         if (rc2 != 0)
2856                 return rc2;
2857
2858         if (rc != 0)
2859                 rc = -EINVAL;
2860
2861 #ifndef HAVE_OFED_IB_DEVICE_ATTRS
2862 out_clean_attr:
2863         LIBCFS_FREE(dev_attr, sizeof(*dev_attr));
2864 #endif
2865
2866         if (rc == -ENOSYS)
2867                 CERROR("IB device does not support FMRs nor FastRegs, can't "
2868                        "register memory: %d\n", rc);
2869         else if (rc == -EINVAL)
2870                 CERROR("Invalid mr size: %#llx\n", hdev->ibh_mr_size);
2871         return rc;
2872 }
2873
2874 #ifdef HAVE_OFED_IB_GET_DMA_MR
2875 static void
2876 kiblnd_hdev_cleanup_mrs(struct kib_hca_dev *hdev)
2877 {
2878         if (hdev->ibh_mrs == NULL)
2879                 return;
2880
2881         ib_dereg_mr(hdev->ibh_mrs);
2882
2883         hdev->ibh_mrs = NULL;
2884 }
2885 #endif
2886
2887 void
2888 kiblnd_hdev_destroy(struct kib_hca_dev *hdev)
2889 {
2890         if (hdev->ibh_event_handler.device != NULL)
2891                 ib_unregister_event_handler(&hdev->ibh_event_handler);
2892
2893 #ifdef HAVE_OFED_IB_GET_DMA_MR
2894         kiblnd_hdev_cleanup_mrs(hdev);
2895 #endif
2896
2897         if (hdev->ibh_pd != NULL)
2898                 ib_dealloc_pd(hdev->ibh_pd);
2899
2900         if (hdev->ibh_cmid != NULL)
2901                 rdma_destroy_id(hdev->ibh_cmid);
2902
2903         LIBCFS_FREE(hdev, sizeof(*hdev));
2904 }
2905
2906 #ifdef HAVE_OFED_IB_GET_DMA_MR
2907 static int
2908 kiblnd_hdev_setup_mrs(struct kib_hca_dev *hdev)
2909 {
2910         struct ib_mr *mr;
2911         int           acflags = IB_ACCESS_LOCAL_WRITE |
2912                                 IB_ACCESS_REMOTE_WRITE;
2913
2914         mr = ib_get_dma_mr(hdev->ibh_pd, acflags);
2915         if (IS_ERR(mr)) {
2916                 CERROR("Failed ib_get_dma_mr: %ld\n", PTR_ERR(mr));
2917                 kiblnd_hdev_cleanup_mrs(hdev);
2918                 return PTR_ERR(mr);
2919         }
2920
2921         hdev->ibh_mrs = mr;
2922
2923         return 0;
2924 }
2925 #endif
2926
2927 static int
2928 kiblnd_dummy_callback(struct rdma_cm_id *cmid, struct rdma_cm_event *event)
2929 {       /* DUMMY */
2930         return 0;
2931 }
2932
2933 static int
2934 kiblnd_dev_need_failover(struct kib_dev *dev, struct net *ns)
2935 {
2936         struct rdma_cm_id  *cmid;
2937         struct sockaddr_in  srcaddr;
2938         struct sockaddr_in  dstaddr;
2939         int                 rc;
2940
2941         if (dev->ibd_hdev == NULL || /* initializing */
2942             dev->ibd_hdev->ibh_cmid == NULL || /* listener is dead */
2943             *kiblnd_tunables.kib_dev_failover > 1) /* debugging */
2944                 return 1;
2945
2946         /* XXX: it's UGLY, but I don't have better way to find
2947          * ib-bonding HCA failover because:
2948          *
2949          * a. no reliable CM event for HCA failover...
2950          * b. no OFED API to get ib_device for current net_device...
2951          *
2952          * We have only two choices at this point:
2953          *
2954          * a. rdma_bind_addr(), it will conflict with listener cmid
2955          * b. rdma_resolve_addr() to zero addr */
2956         cmid = kiblnd_rdma_create_id(ns, kiblnd_dummy_callback, dev,
2957                                      RDMA_PS_TCP, IB_QPT_RC);
2958         if (IS_ERR(cmid)) {
2959                 rc = PTR_ERR(cmid);
2960                 CERROR("Failed to create cmid for failover: %d\n", rc);
2961                 return rc;
2962         }
2963
2964         memset(&srcaddr, 0, sizeof(srcaddr));
2965         srcaddr.sin_family      = AF_INET;
2966         srcaddr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
2967
2968         memset(&dstaddr, 0, sizeof(dstaddr));
2969         dstaddr.sin_family = AF_INET;
2970         rc = rdma_resolve_addr(cmid, (struct sockaddr *)&srcaddr,
2971                                (struct sockaddr *)&dstaddr, 1);
2972         if (rc != 0 || cmid->device == NULL) {
2973                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
2974                        dev->ibd_ifname, &dev->ibd_ifip,
2975                        cmid->device, rc);
2976                 rdma_destroy_id(cmid);
2977                 return rc;
2978         }
2979
2980         rc = dev->ibd_hdev->ibh_ibdev != cmid->device; /* true for failover */
2981         rdma_destroy_id(cmid);
2982         return rc;
2983 }
2984
2985 int
2986 kiblnd_dev_failover(struct kib_dev *dev, struct net *ns)
2987 {
2988         LIST_HEAD(zombie_tpo);
2989         LIST_HEAD(zombie_ppo);
2990         LIST_HEAD(zombie_fpo);
2991         struct rdma_cm_id  *cmid  = NULL;
2992         struct kib_hca_dev *hdev  = NULL;
2993         struct kib_hca_dev *old;
2994         struct ib_pd       *pd;
2995         struct kib_net *net;
2996         struct sockaddr_in  addr;
2997         struct net_device *netdev;
2998         unsigned long       flags;
2999         int                 rc = 0;
3000         int                 i;
3001         bool                set_fatal = true;
3002
3003         LASSERT(*kiblnd_tunables.kib_dev_failover > 1 ||
3004                 dev->ibd_can_failover ||
3005                 dev->ibd_hdev == NULL);
3006
3007         rc = kiblnd_dev_need_failover(dev, ns);
3008         if (rc <= 0)
3009                 goto out;
3010
3011         if (dev->ibd_hdev != NULL &&
3012             dev->ibd_hdev->ibh_cmid != NULL) {
3013                 /* XXX it's not good to close old listener at here,
3014                  * because we can fail to create new listener.
3015                  * But we have to close it now, otherwise rdma_bind_addr
3016                  * will return EADDRINUSE... How crap! */
3017                 write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3018
3019                 cmid = dev->ibd_hdev->ibh_cmid;
3020                 /* make next schedule of kiblnd_dev_need_failover()
3021                  * return 1 for me */
3022                 dev->ibd_hdev->ibh_cmid  = NULL;
3023                 write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3024
3025                 rdma_destroy_id(cmid);
3026         }
3027
3028         cmid = kiblnd_rdma_create_id(ns, kiblnd_cm_callback, dev, RDMA_PS_TCP,
3029                                      IB_QPT_RC);
3030         if (IS_ERR(cmid)) {
3031                 rc = PTR_ERR(cmid);
3032                 CERROR("Failed to create cmid for failover: %d\n", rc);
3033                 goto out;
3034         }
3035
3036         memset(&addr, 0, sizeof(addr));
3037         addr.sin_family      = AF_INET;
3038         addr.sin_addr.s_addr = (__force u32)htonl(dev->ibd_ifip);
3039         addr.sin_port        = htons(*kiblnd_tunables.kib_service);
3040
3041         /* Bind to failover device or port */
3042         rc = rdma_bind_addr(cmid, (struct sockaddr *)&addr);
3043         if (rc != 0 || cmid->device == NULL) {
3044                 CERROR("Failed to bind %s:%pI4h to device(%p): %d\n",
3045                        dev->ibd_ifname, &dev->ibd_ifip,
3046                        cmid->device, rc);
3047                 if (!rc && !cmid->device)
3048                         set_fatal = false;
3049                 rdma_destroy_id(cmid);
3050                 goto out;
3051         }
3052
3053         LIBCFS_ALLOC(hdev, sizeof(*hdev));
3054         if (hdev == NULL) {
3055                 CERROR("Failed to allocate kib_hca_dev\n");
3056                 rdma_destroy_id(cmid);
3057                 rc = -ENOMEM;
3058                 goto out;
3059         }
3060
3061         atomic_set(&hdev->ibh_ref, 1);
3062         hdev->ibh_dev   = dev;
3063         hdev->ibh_cmid  = cmid;
3064         hdev->ibh_ibdev = cmid->device;
3065         hdev->ibh_port  = cmid->port_num;
3066
3067 #ifdef HAVE_OFED_IB_ALLOC_PD_2ARGS
3068         pd = ib_alloc_pd(cmid->device, 0);
3069 #else
3070         pd = ib_alloc_pd(cmid->device);
3071 #endif
3072         if (IS_ERR(pd)) {
3073                 rc = PTR_ERR(pd);
3074                 CERROR("Can't allocate PD: %d\n", rc);
3075                 goto out;
3076         }
3077
3078         hdev->ibh_pd = pd;
3079
3080         rc = rdma_listen(cmid, 0);
3081         if (rc != 0) {
3082                 CERROR("Can't start new listener: %d\n", rc);
3083                 goto out;
3084         }
3085
3086         rc = kiblnd_hdev_get_attr(hdev);
3087         if (rc != 0) {
3088                 CERROR("Can't get device attributes: %d\n", rc);
3089                 goto out;
3090         }
3091
3092 #ifdef HAVE_OFED_IB_GET_DMA_MR
3093         rc = kiblnd_hdev_setup_mrs(hdev);
3094         if (rc != 0) {
3095                 CERROR("Can't setup device: %d\n", rc);
3096                 goto out;
3097         }
3098 #endif
3099
3100         INIT_IB_EVENT_HANDLER(&hdev->ibh_event_handler,
3101                                 hdev->ibh_ibdev, kiblnd_event_handler);
3102         ib_register_event_handler(&hdev->ibh_event_handler);
3103
3104         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3105
3106         old = dev->ibd_hdev;
3107         dev->ibd_hdev = hdev;   /* take over the refcount */
3108         hdev = old;
3109
3110         list_for_each_entry(net, &dev->ibd_nets, ibn_list) {
3111                 cfs_cpt_for_each(i, lnet_cpt_table()) {
3112                         kiblnd_fail_poolset(&net->ibn_tx_ps[i]->tps_poolset,
3113                                             &zombie_tpo);
3114
3115                         if (net->ibn_fmr_ps != NULL)
3116                                 kiblnd_fail_fmr_poolset(net->ibn_fmr_ps[i],
3117                                                         &zombie_fpo);
3118                 }
3119         }
3120
3121         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3122  out:
3123         if (!list_empty(&zombie_tpo))
3124                 kiblnd_destroy_pool_list(&zombie_tpo);
3125         if (!list_empty(&zombie_ppo))
3126                 kiblnd_destroy_pool_list(&zombie_ppo);
3127         if (!list_empty(&zombie_fpo))
3128                 kiblnd_destroy_fmr_pool_list(&zombie_fpo);
3129         if (hdev != NULL)
3130                 kiblnd_hdev_decref(hdev);
3131
3132         if (rc != 0) {
3133                 dev->ibd_failed_failover++;
3134         } else {
3135                 dev->ibd_failed_failover = 0;
3136
3137                 if (set_fatal) {
3138                         rcu_read_lock();
3139                         netdev = dev_get_by_name_rcu(ns, dev->ibd_ifname);
3140                         if (netdev && (lnet_get_link_status(netdev) == 1))
3141                                 kiblnd_set_ni_fatal_on(dev->ibd_hdev, 0);
3142                         rcu_read_unlock();
3143                 }
3144         }
3145
3146         return rc;
3147 }
3148
3149 void
3150 kiblnd_destroy_dev(struct kib_dev *dev)
3151 {
3152         LASSERT(dev->ibd_nnets == 0);
3153         LASSERT(list_empty(&dev->ibd_nets));
3154
3155         list_del(&dev->ibd_fail_list);
3156         list_del(&dev->ibd_list);
3157
3158         if (dev->ibd_hdev != NULL)
3159                 kiblnd_hdev_decref(dev->ibd_hdev);
3160
3161         LIBCFS_FREE(dev, sizeof(*dev));
3162 }
3163
3164 static struct kib_dev *
3165 kiblnd_dev_search(char *ifname)
3166 {
3167         struct kib_dev *alias = NULL;
3168         struct kib_dev *dev;
3169         char *colon;
3170         char *colon2;
3171
3172         colon = strchr(ifname, ':');
3173         list_for_each_entry(dev, &kiblnd_data.kib_devs, ibd_list) {
3174                 if (strcmp(&dev->ibd_ifname[0], ifname) == 0)
3175                         return dev;
3176
3177                 if (alias != NULL)
3178                         continue;
3179
3180                 colon2 = strchr(dev->ibd_ifname, ':');
3181                 if (colon != NULL)
3182                         *colon = 0;
3183                 if (colon2 != NULL)
3184                         *colon2 = 0;
3185
3186                 if (strcmp(&dev->ibd_ifname[0], ifname) == 0)
3187                         alias = dev;
3188
3189                 if (colon != NULL)
3190                         *colon = ':';
3191                 if (colon2 != NULL)
3192                         *colon2 = ':';
3193         }
3194         return alias;
3195 }
3196
3197 static int
3198 kiblnd_handle_link_state_change(struct net_device *dev,
3199                                 unsigned char operstate)
3200 {
3201         struct lnet_ni *ni = NULL;
3202         struct kib_dev *event_kibdev;
3203         struct kib_net *net;
3204         struct kib_net *cnxt;
3205         bool link_down = !(operstate == IF_OPER_UP);
3206         struct in_device *in_dev;
3207         bool found_ip = false;
3208         __u32 ni_state_before;
3209         bool update_ping_buf = false;
3210         int state;
3211         DECLARE_CONST_IN_IFADDR(ifa);
3212
3213         event_kibdev = kiblnd_dev_search(dev->name);
3214
3215         if (!event_kibdev)
3216                 goto out;
3217
3218         list_for_each_entry_safe(net, cnxt, &event_kibdev->ibd_nets, ibn_list) {
3219                 found_ip = false;
3220                 ni = net->ibn_ni;
3221
3222                 in_dev = __in_dev_get_rtnl(dev);
3223                 if (!in_dev) {
3224                         CDEBUG(D_NET, "Interface %s has no IPv4 status.\n",
3225                                dev->name);
3226                         ni_state_before = lnet_set_link_fatal_state(ni, 1);
3227                         goto ni_done;
3228                 }
3229                 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3230                         if (htonl(event_kibdev->ibd_ifip) == ifa->ifa_local)
3231                                 found_ip = true;
3232                 }
3233                 endfor_ifa(in_dev);
3234
3235                 if (!found_ip) {
3236                         CDEBUG(D_NET, "Interface %s has no matching ip\n",
3237                                dev->name);
3238                         ni_state_before = lnet_set_link_fatal_state(ni, 1);
3239                         goto ni_done;
3240                 }
3241
3242                 if (link_down) {
3243                         ni_state_before = lnet_set_link_fatal_state(ni, 1);
3244                 } else {
3245                         state = (lnet_get_link_status(dev) == 0);
3246                         ni_state_before = lnet_set_link_fatal_state(ni,
3247                                                                     state);
3248                 }
3249 ni_done:
3250                 if (!update_ping_buf &&
3251                     (ni->ni_state == LNET_NI_STATE_ACTIVE) &&
3252                     (atomic_read(&ni->ni_fatal_error_on) != ni_state_before) &&
3253                     (net->ibn_init == IBLND_INIT_ALL))
3254                         update_ping_buf = true;
3255         }
3256
3257         if (update_ping_buf)
3258                 lnet_mark_ping_buffer_for_update();
3259 out:
3260         return 0;
3261 }
3262
3263 static int
3264 kiblnd_handle_inetaddr_change(struct in_ifaddr *ifa, unsigned long event)
3265 {
3266         struct kib_dev *event_kibdev;
3267         struct kib_net *net;
3268         struct kib_net *cnxt;
3269         struct net_device *event_netdev = ifa->ifa_dev->dev;
3270         __u32 ni_state_before;
3271         bool update_ping_buf = false;
3272         struct lnet_ni *ni = NULL;
3273         bool link_down;
3274
3275         event_kibdev = kiblnd_dev_search(event_netdev->name);
3276
3277         if (!event_kibdev)
3278                 goto out;
3279
3280         if (htonl(event_kibdev->ibd_ifip) != ifa->ifa_local)
3281                 goto out;
3282
3283         list_for_each_entry_safe(net, cnxt, &event_kibdev->ibd_nets,
3284                                  ibn_list) {
3285                 ni = net->ibn_ni;
3286                 link_down = (event == NETDEV_DOWN);
3287                 ni_state_before = lnet_set_link_fatal_state(ni, link_down);
3288                 if (!update_ping_buf &&
3289                     (ni->ni_state == LNET_NI_STATE_ACTIVE) &&
3290                     ((event == NETDEV_DOWN) != ni_state_before) &&
3291                     (net->ibn_init == IBLND_INIT_ALL))
3292                         update_ping_buf = true;
3293         }
3294
3295         if (update_ping_buf)
3296                 lnet_mark_ping_buffer_for_update();
3297 out:
3298         return 0;
3299 }
3300
3301
3302 /************************************
3303  * Net device notifier event handler
3304  ************************************/
3305 static int kiblnd_device_event(struct notifier_block *unused,
3306                                  unsigned long event, void *ptr)
3307 {
3308         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3309         unsigned char operstate;
3310
3311         operstate = dev->operstate;
3312
3313         CDEBUG(D_NET, "devevent: status=%ld, iface=%s ifindex %d state %u\n",
3314                event, dev->name, dev->ifindex, operstate);
3315
3316         switch (event) {
3317         case NETDEV_UP:
3318         case NETDEV_DOWN:
3319         case NETDEV_CHANGE:
3320                 kiblnd_handle_link_state_change(dev, operstate);
3321                 break;
3322         }
3323
3324         return NOTIFY_OK;
3325 }
3326
3327 /************************************
3328  * Inetaddr notifier event handler
3329  ************************************/
3330 static int kiblnd_inetaddr_event(struct notifier_block *unused,
3331                                  unsigned long event, void *ptr)
3332 {
3333         struct in_ifaddr *ifa = ptr;
3334
3335         CDEBUG(D_NET, "addrevent: status %ld ip addr %pI4, netmask %pI4.\n",
3336                event, &ifa->ifa_address, &ifa->ifa_mask);
3337
3338         switch (event) {
3339         case NETDEV_UP:
3340         case NETDEV_DOWN:
3341         case NETDEV_CHANGE:
3342                 kiblnd_handle_inetaddr_change(ifa, event);
3343                 break;
3344
3345         }
3346         return NOTIFY_OK;
3347 }
3348
3349 static struct notifier_block kiblnd_dev_notifier_block = {
3350         .notifier_call = kiblnd_device_event,
3351 };
3352
3353 static struct notifier_block kiblnd_inetaddr_notifier_block = {
3354         .notifier_call = kiblnd_inetaddr_event,
3355 };
3356
3357 static void
3358 kiblnd_base_shutdown(void)
3359 {
3360         struct kib_sched_info *sched;
3361         struct kib_peer_ni *peer_ni;
3362         int i;
3363
3364         LASSERT(list_empty(&kiblnd_data.kib_devs));
3365
3366         CDEBUG(D_MALLOC, "before LND base cleanup: kmem %lld\n",
3367                libcfs_kmem_read());
3368
3369         if (kiblnd_data.kib_init == IBLND_INIT_ALL) {
3370                 unregister_netdevice_notifier(&kiblnd_dev_notifier_block);
3371                 unregister_inetaddr_notifier(&kiblnd_inetaddr_notifier_block);
3372         }
3373
3374         switch (kiblnd_data.kib_init) {
3375         default:
3376                 LBUG();
3377
3378         case IBLND_INIT_ALL:
3379         case IBLND_INIT_DATA:
3380                 hash_for_each(kiblnd_data.kib_peers, i, peer_ni, ibp_list)
3381                         LASSERT(0);
3382                 LASSERT(list_empty(&kiblnd_data.kib_connd_zombies));
3383                 LASSERT(list_empty(&kiblnd_data.kib_connd_conns));
3384                 LASSERT(list_empty(&kiblnd_data.kib_reconn_list));
3385                 LASSERT(list_empty(&kiblnd_data.kib_reconn_wait));
3386
3387                 /* flag threads to terminate; wake and wait for them to die */
3388                 kiblnd_data.kib_shutdown = 1;
3389
3390                 /* NB: we really want to stop scheduler threads net by net
3391                  * instead of the whole module, this should be improved
3392                  * with dynamic configuration LNet.
3393                  */
3394                 cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds)
3395                         wake_up_all(&sched->ibs_waitq);
3396
3397                 wake_up(&kiblnd_data.kib_connd_waitq);
3398                 wake_up(&kiblnd_data.kib_failover_waitq);
3399
3400                 wait_var_event_warning(&kiblnd_data.kib_nthreads,
3401                                        !atomic_read(&kiblnd_data.kib_nthreads),
3402                                        "Waiting for %d threads to terminate\n",
3403                                        atomic_read(&kiblnd_data.kib_nthreads));
3404                 fallthrough;
3405
3406         case IBLND_INIT_NOTHING:
3407                 break;
3408         }
3409
3410         if (kiblnd_data.kib_scheds != NULL)
3411                 cfs_percpt_free(kiblnd_data.kib_scheds);
3412
3413         CDEBUG(D_MALLOC, "after LND base cleanup: kmem %lld\n",
3414                libcfs_kmem_read());
3415
3416         kiblnd_data.kib_init = IBLND_INIT_NOTHING;
3417         module_put(THIS_MODULE);
3418 }
3419
3420 static void
3421 kiblnd_shutdown(struct lnet_ni *ni)
3422 {
3423         struct kib_net *net = ni->ni_data;
3424         rwlock_t     *g_lock = &kiblnd_data.kib_global_lock;
3425         unsigned long     flags;
3426
3427         LASSERT(kiblnd_data.kib_init == IBLND_INIT_ALL);
3428
3429         if (net == NULL)
3430                 goto out;
3431
3432         CDEBUG(D_MALLOC, "before LND net cleanup: kmem %lld\n",
3433                libcfs_kmem_read());
3434
3435         write_lock_irqsave(g_lock, flags);
3436         net->ibn_shutdown = 1;
3437         write_unlock_irqrestore(g_lock, flags);
3438
3439         switch (net->ibn_init) {
3440         default:
3441                 LBUG();
3442
3443         case IBLND_INIT_ALL:
3444                 /* nuke all existing peers within this net */
3445                 kiblnd_del_peer(ni, LNET_NID_ANY);
3446
3447                 /* Wait for all peer_ni state to clean up */
3448                 wait_var_event_warning(&net->ibn_npeers,
3449                                        atomic_read(&net->ibn_npeers) == 0,
3450                                        "%s: waiting for %d peers to disconnect\n",
3451                                        libcfs_nidstr(&ni->ni_nid),
3452                                        atomic_read(&net->ibn_npeers));
3453
3454                 kiblnd_net_fini_pools(net);
3455
3456                 write_lock_irqsave(g_lock, flags);
3457                 LASSERT(net->ibn_dev->ibd_nnets > 0);
3458                 net->ibn_dev->ibd_nnets--;
3459                 list_del(&net->ibn_list);
3460                 write_unlock_irqrestore(g_lock, flags);
3461
3462                 wake_up_all(&kiblnd_data.kib_connd_waitq);
3463                 wait_var_event_warning(&net->ibn_nconns,
3464                                        atomic_read(&net->ibn_nconns) == 0,
3465                                        "%s: waiting for %d conns to clean\n",
3466                                        libcfs_nidstr(&ni->ni_nid),
3467                                        atomic_read(&net->ibn_nconns));
3468                 fallthrough;
3469
3470         case IBLND_INIT_NOTHING:
3471                 LASSERT (atomic_read(&net->ibn_nconns) == 0);
3472
3473                 if (net->ibn_dev != NULL &&
3474                     net->ibn_dev->ibd_nnets == 0)
3475                         kiblnd_destroy_dev(net->ibn_dev);
3476
3477                 break;
3478         }
3479
3480         CDEBUG(D_MALLOC, "after LND net cleanup: kmem %lld\n",
3481                libcfs_kmem_read());
3482
3483         net->ibn_init = IBLND_INIT_NOTHING;
3484         ni->ni_data = NULL;
3485
3486         LIBCFS_FREE(net, sizeof(*net));
3487
3488 out:
3489         if (list_empty(&kiblnd_data.kib_devs))
3490                 kiblnd_base_shutdown();
3491 }
3492
3493 static int
3494 kiblnd_base_startup(struct net *ns)
3495 {
3496         struct kib_sched_info *sched;
3497         int rc;
3498         int i;
3499
3500         LASSERT(kiblnd_data.kib_init == IBLND_INIT_NOTHING);
3501
3502         if (!try_module_get(THIS_MODULE))
3503                 goto failed;
3504
3505         memset(&kiblnd_data, 0, sizeof(kiblnd_data)); /* zero pointers, flags etc */
3506
3507         rwlock_init(&kiblnd_data.kib_global_lock);
3508
3509         INIT_LIST_HEAD(&kiblnd_data.kib_devs);
3510         INIT_LIST_HEAD(&kiblnd_data.kib_failed_devs);
3511
3512         hash_init(kiblnd_data.kib_peers);
3513
3514         spin_lock_init(&kiblnd_data.kib_connd_lock);
3515         INIT_LIST_HEAD(&kiblnd_data.kib_connd_conns);
3516         INIT_LIST_HEAD(&kiblnd_data.kib_connd_waits);
3517         INIT_LIST_HEAD(&kiblnd_data.kib_connd_zombies);
3518         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_list);
3519         INIT_LIST_HEAD(&kiblnd_data.kib_reconn_wait);
3520
3521         init_waitqueue_head(&kiblnd_data.kib_connd_waitq);
3522         init_waitqueue_head(&kiblnd_data.kib_failover_waitq);
3523
3524         kiblnd_data.kib_scheds = cfs_percpt_alloc(lnet_cpt_table(),
3525                                                   sizeof(*sched));
3526         if (kiblnd_data.kib_scheds == NULL)
3527                 goto failed;
3528
3529         cfs_percpt_for_each(sched, i, kiblnd_data.kib_scheds) {
3530                 int     nthrs;
3531
3532                 spin_lock_init(&sched->ibs_lock);
3533                 INIT_LIST_HEAD(&sched->ibs_conns);
3534                 init_waitqueue_head(&sched->ibs_waitq);
3535
3536                 nthrs = cfs_cpt_weight(lnet_cpt_table(), i);
3537                 if (*kiblnd_tunables.kib_nscheds > 0) {
3538                         nthrs = min(nthrs, *kiblnd_tunables.kib_nscheds);
3539                 } else {
3540                         /* max to half of CPUs, another half is reserved for
3541                          * upper layer modules */
3542                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
3543                 }
3544
3545                 sched->ibs_nthreads_max = nthrs;
3546                 sched->ibs_cpt = i;
3547         }
3548
3549         kiblnd_data.kib_error_qpa.qp_state = IB_QPS_ERR;
3550
3551         /* lists/ptrs/locks initialised */
3552         kiblnd_data.kib_init = IBLND_INIT_DATA;
3553         /*****************************************************/
3554
3555         rc = kiblnd_thread_start(kiblnd_connd, NULL, "kiblnd_connd");
3556         if (rc != 0) {
3557                 CERROR("Can't spawn o2iblnd connd: %d\n", rc);
3558                 goto failed;
3559         }
3560
3561         if (*kiblnd_tunables.kib_dev_failover != 0)
3562                 rc = kiblnd_thread_start(kiblnd_failover_thread, ns,
3563                                          "kiblnd_failover");
3564
3565         if (rc != 0) {
3566                 CERROR("Can't spawn o2iblnd failover thread: %d\n", rc);
3567                 goto failed;
3568         }
3569
3570         register_netdevice_notifier(&kiblnd_dev_notifier_block);
3571         register_inetaddr_notifier(&kiblnd_inetaddr_notifier_block);
3572
3573         /* flag everything initialised */
3574         kiblnd_data.kib_init = IBLND_INIT_ALL;
3575         /*****************************************************/
3576
3577         return 0;
3578
3579  failed:
3580         kiblnd_base_shutdown();
3581         return -ENETDOWN;
3582 }
3583
3584 static int
3585 kiblnd_start_schedulers(struct kib_sched_info *sched)
3586 {
3587         int     rc = 0;
3588         int     nthrs;
3589         int     i;
3590
3591         if (sched->ibs_nthreads == 0) {
3592                 if (*kiblnd_tunables.kib_nscheds > 0) {
3593                         nthrs = sched->ibs_nthreads_max;
3594                 } else {
3595                         nthrs = cfs_cpt_weight(lnet_cpt_table(),
3596                                                sched->ibs_cpt);
3597                         nthrs = min(max(IBLND_N_SCHED, nthrs >> 1), nthrs);
3598                         nthrs = min(IBLND_N_SCHED_HIGH, nthrs);
3599                 }
3600         } else {
3601                 LASSERT(sched->ibs_nthreads <= sched->ibs_nthreads_max);
3602                 /* increase one thread if there is new interface */
3603                 nthrs = (sched->ibs_nthreads < sched->ibs_nthreads_max);
3604         }
3605
3606         for (i = 0; i < nthrs; i++) {
3607                 long    id = KIB_THREAD_ID(sched->ibs_cpt, sched->ibs_nthreads + i);
3608
3609                 rc = kiblnd_thread_start(kiblnd_scheduler, (void *)id,
3610                                          "kiblnd_sd_%02ld_%02ld",
3611                                          KIB_THREAD_CPT(id), KIB_THREAD_TID(id));
3612                 if (rc == 0)
3613                         continue;
3614
3615                 CERROR("Can't spawn thread %d for scheduler[%d]: %d\n",
3616                        sched->ibs_cpt, sched->ibs_nthreads + i, rc);
3617                 break;
3618         }
3619
3620         sched->ibs_nthreads += i;
3621         return rc;
3622 }
3623
3624 static int kiblnd_dev_start_threads(struct kib_dev *dev, bool newdev, u32 *cpts,
3625                                     int ncpts)
3626 {
3627         int     cpt;
3628         int     rc;
3629         int     i;
3630
3631         for (i = 0; i < ncpts; i++) {
3632                 struct kib_sched_info *sched;
3633
3634                 cpt = (cpts == NULL) ? i : cpts[i];
3635                 sched = kiblnd_data.kib_scheds[cpt];
3636
3637                 if (!newdev && sched->ibs_nthreads > 0)
3638                         continue;
3639
3640                 rc = kiblnd_start_schedulers(kiblnd_data.kib_scheds[cpt]);
3641                 if (rc != 0) {
3642                         CERROR("Failed to start scheduler threads for %s\n",
3643                                dev->ibd_ifname);
3644                         return rc;
3645                 }
3646         }
3647         return 0;
3648 }
3649
3650 static int
3651 kiblnd_startup(struct lnet_ni *ni)
3652 {
3653         char *ifname = NULL;
3654         struct lnet_inetdev *ifaces = NULL;
3655         struct kib_dev *ibdev = NULL;
3656         struct kib_net *net = NULL;
3657         unsigned long flags;
3658         int rc;
3659         int i;
3660         bool newdev;
3661         struct net_device *netdev;
3662
3663         LASSERT(ni->ni_net->net_lnd == &the_o2iblnd);
3664
3665         if (kiblnd_data.kib_init == IBLND_INIT_NOTHING) {
3666                 rc = kiblnd_base_startup(ni->ni_net_ns);
3667                 if (rc != 0)
3668                         return rc;
3669         }
3670
3671         LIBCFS_ALLOC(net, sizeof(*net));
3672         ni->ni_data = net;
3673         if (net == NULL) {
3674                 rc = -ENOMEM;
3675                 goto failed;
3676         }
3677
3678         net->ibn_ni = ni;
3679         net->ibn_incarnation = ktime_get_real_ns() / NSEC_PER_USEC;
3680
3681         kiblnd_tunables_setup(ni);
3682
3683         /* Multi-Rail wants each secondary
3684          * IP to be treated as an unique 'struct ni' interface.
3685          */
3686         if (ni->ni_interface != NULL) {
3687                 /* Use the IPoIB interface specified in 'networks=' */
3688                 ifname = ni->ni_interface;
3689         } else {
3690                 ifname = *kiblnd_tunables.kib_default_ipif;
3691                 rc = libcfs_strnid(&ni->ni_nid, ifname);
3692                 if (rc < 0 || ni->ni_nid.nid_type != O2IBLND)
3693                         memset(&ni->ni_nid, 0, sizeof(ni->ni_nid));
3694         }
3695
3696         if (strlen(ifname) >= sizeof(ibdev->ibd_ifname)) {
3697                 CERROR("IPoIB interface name too long: %s\n", ifname);
3698                 rc = -E2BIG;
3699                 goto failed;
3700         }
3701
3702         rc = lnet_inet_enumerate(&ifaces, ni->ni_net_ns, false);
3703         if (rc < 0)
3704                 goto failed;
3705
3706         i = lnet_inet_select(ni, ifaces, rc);
3707         if (i < 0)
3708                 goto failed;
3709
3710         if (nid_addr_is_set(&ni->ni_nid)) {
3711                 strscpy(ifname, ifaces[i].li_name, sizeof(ifname));
3712         } else if (strcmp(ifname, ifaces[i].li_name) != 0) {
3713                 CERROR("ko2iblnd: No matching interfaces\n");
3714                 rc = -ENOENT;
3715                 goto failed;
3716         }
3717
3718         ibdev = kiblnd_dev_search(ifname);
3719         newdev = ibdev == NULL;
3720         /* hmm...create kib_dev even for alias */
3721         if (ibdev == NULL || strcmp(&ibdev->ibd_ifname[0], ifname) != 0) {
3722                 LIBCFS_ALLOC(ibdev, sizeof(*ibdev));
3723                 if (!ibdev) {
3724                         rc = -ENOMEM;
3725                         goto failed;
3726                 }
3727
3728                 ibdev->ibd_ifip = ntohl(ifaces[i].li_ipaddr);
3729                 strlcpy(ibdev->ibd_ifname, ifaces[i].li_name,
3730                         sizeof(ibdev->ibd_ifname));
3731                 ibdev->ibd_can_failover = ifaces[i].li_iff_master;
3732
3733                 INIT_LIST_HEAD(&ibdev->ibd_nets);
3734                 INIT_LIST_HEAD(&ibdev->ibd_list); /* not yet in kib_devs */
3735                 INIT_LIST_HEAD(&ibdev->ibd_fail_list);
3736
3737                 /* initialize the device */
3738                 rc = kiblnd_dev_failover(ibdev, ni->ni_net_ns);
3739                 if (rc) {
3740                         CERROR("ko2iblnd: Can't initialize device: rc = %d\n",
3741                                rc);
3742                         goto failed;
3743                 }
3744
3745                 list_add_tail(&ibdev->ibd_list, &kiblnd_data.kib_devs);
3746         }
3747
3748         net->ibn_dev = ibdev;
3749         ni->ni_nid.nid_addr[0] = cpu_to_be32(ibdev->ibd_ifip);
3750         if (!ni->ni_interface) {
3751                 rc = lnet_ni_add_interface(ni, ifaces[i].li_name);
3752                 if (rc < 0)
3753                         CWARN("ko2iblnd failed to allocate ni_interface\n");
3754         }
3755         ni->ni_dev_cpt = ifaces[i].li_cpt;
3756
3757         rc = kiblnd_dev_start_threads(ibdev, newdev, ni->ni_cpts, ni->ni_ncpts);
3758         if (rc != 0)
3759                 goto failed;
3760
3761         rc = kiblnd_net_init_pools(net, ni, ni->ni_cpts, ni->ni_ncpts);
3762         if (rc != 0) {
3763                 CERROR("Failed to initialize NI pools: %d\n", rc);
3764                 goto failed;
3765         }
3766
3767         write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
3768         ibdev->ibd_nnets++;
3769         list_add_tail(&net->ibn_list, &ibdev->ibd_nets);
3770         /* for health check */
3771         if (ibdev->ibd_hdev->ibh_state == IBLND_DEV_PORT_DOWN)
3772                 kiblnd_set_ni_fatal_on(ibdev->ibd_hdev, 1);
3773
3774         rcu_read_lock();
3775         netdev = dev_get_by_name_rcu(ni->ni_net_ns, net->ibn_dev->ibd_ifname);
3776         if (netdev &&
3777             ((netdev->reg_state == NETREG_UNREGISTERING) ||
3778              (netdev->operstate != IF_OPER_UP) ||
3779             (lnet_get_link_status(netdev) == 0))) {
3780                 kiblnd_set_ni_fatal_on(ibdev->ibd_hdev, 1);
3781         }
3782         rcu_read_unlock();
3783
3784         write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
3785
3786         net->ibn_init = IBLND_INIT_ALL;
3787
3788         return 0;
3789
3790 failed:
3791         if (net != NULL && net->ibn_dev == NULL && ibdev != NULL)
3792                 kiblnd_destroy_dev(ibdev);
3793
3794         kfree(ifaces);
3795         kiblnd_shutdown(ni);
3796
3797         CDEBUG(D_NET, "Configuration of device %s failed: rc = %d\n",
3798                ifname ? ifname : "", rc);
3799
3800         return -ENETDOWN;
3801 }
3802
3803 static const struct lnet_lnd the_o2iblnd = {
3804         .lnd_type       = O2IBLND,
3805         .lnd_startup    = kiblnd_startup,
3806         .lnd_shutdown   = kiblnd_shutdown,
3807         .lnd_ctl        = kiblnd_ctl,
3808         .lnd_send       = kiblnd_send,
3809         .lnd_recv       = kiblnd_recv,
3810         .lnd_get_dev_prio = kiblnd_get_dev_prio,
3811         .lnd_nl_get     = kiblnd_nl_get,
3812         .lnd_nl_set     = kiblnd_nl_set,
3813         .lnd_keys       = &kiblnd_tunables_keys,
3814 };
3815
3816 static void ko2inlnd_assert_wire_constants(void)
3817 {
3818         BUILD_BUG_ON(IBLND_MSG_MAGIC != 0x0be91b91);
3819         BUILD_BUG_ON(IBLND_MSG_VERSION_1 != 0x11);
3820         BUILD_BUG_ON(IBLND_MSG_VERSION_2 != 0x12);
3821         BUILD_BUG_ON(IBLND_MSG_VERSION != IBLND_MSG_VERSION_2);
3822
3823         BUILD_BUG_ON(IBLND_MSG_CONNREQ != 0xc0);
3824         BUILD_BUG_ON(IBLND_MSG_CONNACK != 0xc1);
3825         BUILD_BUG_ON(IBLND_MSG_NOOP != 0xd0);
3826         BUILD_BUG_ON(IBLND_MSG_IMMEDIATE != 0xd1);
3827         BUILD_BUG_ON(IBLND_MSG_PUT_REQ != 0xd2);
3828         BUILD_BUG_ON(IBLND_MSG_PUT_NAK != 0xd3);
3829         BUILD_BUG_ON(IBLND_MSG_PUT_ACK != 0xd4);
3830         BUILD_BUG_ON(IBLND_MSG_PUT_DONE != 0xd5);
3831         BUILD_BUG_ON(IBLND_MSG_GET_REQ != 0xd6);
3832         BUILD_BUG_ON(IBLND_MSG_GET_DONE != 0xd7);
3833
3834         BUILD_BUG_ON(IBLND_REJECT_CONN_RACE != 1);
3835         BUILD_BUG_ON(IBLND_REJECT_NO_RESOURCES != 2);
3836         BUILD_BUG_ON(IBLND_REJECT_FATAL != 3);
3837         BUILD_BUG_ON(IBLND_REJECT_CONN_UNCOMPAT != 4);
3838         BUILD_BUG_ON(IBLND_REJECT_CONN_STALE != 5);
3839         BUILD_BUG_ON(IBLND_REJECT_RDMA_FRAGS != 6);
3840         BUILD_BUG_ON(IBLND_REJECT_MSG_QUEUE_SIZE != 7);
3841         BUILD_BUG_ON(IBLND_REJECT_INVALID_SRV_ID != 8);
3842
3843         BUILD_BUG_ON((int)sizeof(struct kib_connparams) != 8);
3844         BUILD_BUG_ON((int)offsetof(struct kib_connparams, ibcp_queue_depth) != 0);
3845         BUILD_BUG_ON((int)sizeof(((struct kib_connparams *)0)->ibcp_queue_depth) != 2);
3846         BUILD_BUG_ON((int)offsetof(struct kib_connparams, ibcp_max_frags) != 2);
3847         BUILD_BUG_ON((int)sizeof(((struct kib_connparams *)0)->ibcp_max_frags) != 2);
3848         BUILD_BUG_ON((int)offsetof(struct kib_connparams, ibcp_max_msg_size) != 4);
3849         BUILD_BUG_ON((int)sizeof(((struct kib_connparams *)0)->ibcp_max_msg_size) != 4);
3850
3851         BUILD_BUG_ON((int)sizeof(struct kib_immediate_msg) != 72);
3852         BUILD_BUG_ON((int)offsetof(struct kib_immediate_msg, ibim_hdr) != 0);
3853         BUILD_BUG_ON((int)sizeof(((struct kib_immediate_msg *)0)->ibim_hdr) != 72);
3854         BUILD_BUG_ON((int)offsetof(struct kib_immediate_msg, ibim_payload) != 72);
3855         BUILD_BUG_ON((int)sizeof(((struct kib_immediate_msg *)0)->ibim_payload) != 0);
3856
3857         BUILD_BUG_ON((int)sizeof(struct kib_rdma_frag) != 12);
3858         BUILD_BUG_ON((int)offsetof(struct kib_rdma_frag, rf_nob) != 0);
3859         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_frag *)0)->rf_nob) != 4);
3860         BUILD_BUG_ON((int)offsetof(struct kib_rdma_frag, rf_addr) != 4);
3861         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_frag *)0)->rf_addr) != 8);
3862
3863         BUILD_BUG_ON((int)sizeof(struct kib_rdma_desc) != 8);
3864         BUILD_BUG_ON((int)offsetof(struct kib_rdma_desc, rd_key) != 0);
3865         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_desc *)0)->rd_key) != 4);
3866         BUILD_BUG_ON((int)offsetof(struct kib_rdma_desc, rd_nfrags) != 4);
3867         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_desc *)0)->rd_nfrags) != 4);
3868         BUILD_BUG_ON((int)offsetof(struct kib_rdma_desc, rd_frags) != 8);
3869         BUILD_BUG_ON((int)sizeof(((struct kib_rdma_desc *)0)->rd_frags) != 0);
3870
3871         BUILD_BUG_ON((int)sizeof(struct kib_putreq_msg) != 80);
3872         BUILD_BUG_ON((int)offsetof(struct kib_putreq_msg, ibprm_hdr) != 0);
3873         BUILD_BUG_ON((int)sizeof(((struct kib_putreq_msg *)0)->ibprm_hdr) != 72);
3874         BUILD_BUG_ON((int)offsetof(struct kib_putreq_msg, ibprm_cookie) != 72);
3875         BUILD_BUG_ON((int)sizeof(((struct kib_putreq_msg *)0)->ibprm_cookie) != 8);
3876
3877         BUILD_BUG_ON((int)sizeof(struct kib_putack_msg) != 24);
3878         BUILD_BUG_ON((int)offsetof(struct kib_putack_msg, ibpam_src_cookie) != 0);
3879         BUILD_BUG_ON((int)sizeof(((struct kib_putack_msg *)0)->ibpam_src_cookie) != 8);
3880         BUILD_BUG_ON((int)offsetof(struct kib_putack_msg, ibpam_dst_cookie) != 8);
3881         BUILD_BUG_ON((int)sizeof(((struct kib_putack_msg *)0)->ibpam_dst_cookie) != 8);
3882         BUILD_BUG_ON((int)offsetof(struct kib_putack_msg, ibpam_rd) != 16);
3883         BUILD_BUG_ON((int)sizeof(((struct kib_putack_msg *)0)->ibpam_rd) != 8);
3884
3885         BUILD_BUG_ON((int)sizeof(struct kib_get_msg) != 88);
3886         BUILD_BUG_ON((int)offsetof(struct kib_get_msg, ibgm_hdr) != 0);
3887         BUILD_BUG_ON((int)sizeof(((struct kib_get_msg *)0)->ibgm_hdr) != 72);
3888         BUILD_BUG_ON((int)offsetof(struct kib_get_msg, ibgm_cookie) != 72);
3889         BUILD_BUG_ON((int)sizeof(((struct kib_get_msg *)0)->ibgm_cookie) != 8);
3890         BUILD_BUG_ON((int)offsetof(struct kib_get_msg, ibgm_rd) != 80);
3891         BUILD_BUG_ON((int)sizeof(((struct kib_get_msg *)0)->ibgm_rd) != 8);
3892
3893         BUILD_BUG_ON((int)sizeof(struct kib_completion_msg) != 12);
3894         BUILD_BUG_ON((int)offsetof(struct kib_completion_msg, ibcm_cookie) != 0);
3895         BUILD_BUG_ON((int)sizeof(((struct kib_completion_msg *)0)->ibcm_cookie) != 8);
3896         BUILD_BUG_ON((int)offsetof(struct kib_completion_msg, ibcm_status) != 8);
3897         BUILD_BUG_ON((int)sizeof(((struct kib_completion_msg *)0)->ibcm_status) != 4);
3898
3899         /* Checks for struct kib_msg */
3900         //BUILD_BUG_ON((int)sizeof(struct kib_msg) != 12);
3901         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_magic) != 0);
3902         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_magic) != 4);
3903         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_version) != 4);
3904         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_version) != 2);
3905         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_type) != 6);
3906         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_type) != 1);
3907         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_credits) != 7);
3908         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_credits) != 1);
3909         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_nob) != 8);
3910         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_nob) != 4);
3911         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_cksum) != 12);
3912         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_cksum) != 4);
3913         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_srcnid) != 16);
3914         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_srcnid) != 8);
3915         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_srcstamp) != 24);
3916         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_srcstamp) != 8);
3917         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_dstnid) != 32);
3918         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_dstnid) != 8);
3919         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_dststamp) != 40);
3920         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_dststamp) != 8);
3921
3922         /* Connparams */
3923         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.connparams.ibcp_queue_depth) != 48);
3924         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.connparams.ibcp_queue_depth) != 2);
3925         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.connparams.ibcp_max_frags) != 50);
3926         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.connparams.ibcp_max_frags) != 2);
3927         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.connparams.ibcp_max_msg_size) != 52);
3928         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.connparams.ibcp_max_msg_size) != 4);
3929
3930         /* Immediate message */
3931         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.immediate.ibim_hdr) != 48);
3932         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.immediate.ibim_hdr) != 72);
3933         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.immediate.ibim_payload) != 120);
3934         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.immediate.ibim_payload) != 0);
3935
3936         /* PUT req message */
3937         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putreq.ibprm_hdr) != 48);
3938         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putreq.ibprm_hdr) != 72);
3939         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putreq.ibprm_cookie) != 120);
3940         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putreq.ibprm_cookie) != 8);
3941
3942         /* Put ACK */
3943         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putack.ibpam_src_cookie) != 48);
3944         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putack.ibpam_src_cookie) != 8);
3945         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putack.ibpam_dst_cookie) != 56);
3946         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putack.ibpam_dst_cookie) != 8);
3947         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.putack.ibpam_rd) != 64);
3948         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.putack.ibpam_rd) != 8);
3949
3950         /* GET message */
3951         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.get.ibgm_hdr) != 48);
3952         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.get.ibgm_hdr) != 72);
3953         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.get.ibgm_cookie) != 120);
3954         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.get.ibgm_cookie) != 8);
3955         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.get.ibgm_rd) != 128);
3956         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.get.ibgm_rd) != 8);
3957
3958         /* Completion message */
3959         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.completion.ibcm_cookie) != 48);
3960         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.completion.ibcm_cookie) != 8);
3961         BUILD_BUG_ON((int)offsetof(struct kib_msg, ibm_u.completion.ibcm_status) != 56);
3962         BUILD_BUG_ON((int)sizeof(((struct kib_msg *)0)->ibm_u.completion.ibcm_status) != 4);
3963
3964         /* Sanity checks */
3965         BUILD_BUG_ON(sizeof(struct kib_msg) > IBLND_MSG_SIZE);
3966         BUILD_BUG_ON(offsetof(struct kib_msg,
3967                      ibm_u.get.ibgm_rd.rd_frags[IBLND_MAX_RDMA_FRAGS]) >
3968                      IBLND_MSG_SIZE);
3969         BUILD_BUG_ON(offsetof(struct kib_msg,
3970                      ibm_u.putack.ibpam_rd.rd_frags[IBLND_MAX_RDMA_FRAGS]) >
3971                      IBLND_MSG_SIZE);
3972 }
3973
3974 static void __exit ko2iblnd_exit(void)
3975 {
3976         lnet_unregister_lnd(&the_o2iblnd);
3977 }
3978
3979 static int __init ko2iblnd_init(void)
3980 {
3981         int rc;
3982
3983         ko2inlnd_assert_wire_constants();
3984
3985         rc = kiblnd_tunables_init();
3986         if (rc != 0)
3987                 return rc;
3988
3989         rc = libcfs_setup();
3990         if (rc)
3991                 return rc;
3992
3993         lnet_register_lnd(&the_o2iblnd);
3994
3995         return 0;
3996 }
3997
3998 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3999 MODULE_DESCRIPTION("OpenIB gen2 LNet Network Driver");
4000 MODULE_VERSION("2.8.0");
4001 MODULE_LICENSE("GPL");
4002
4003 module_init(ko2iblnd_init);
4004 module_exit(ko2iblnd_exit);